Post slot to event tracker is null

Im trying to set the slots of a conversation before starting the chat with the user such as their name and all. Im able to post the slot name into the event tracker whoever the value comes out as null despite assigning it a value.
POST request doesn’t seem to work but PUT does

PUT api/conversations/23/events

[
    {
        "event": "slot",
        "name": "name",
        "value": "hello",
        "timestamp": 1610316444.2579936981
    }
]

GET api/conversations/23/

> {
>     "sender_id": "23",
>     "slots": {
>         "webstatus": null,
>         "name": null
>     },
>     "latest_message": {
>         "intent": {},
>         "entities": [],
>         "text": null,
>         "message_id": null,
>         "metadata": {}
>     },
>     "latest_event_time": 1610486942.6921339035,
>     "followup_action": "action_session_start",
>     "paused": false,
>     "events": [
>         {
>             "event": "slot",
>             "timestamp": 1610316443.2579936981,
>             "metadata": {
>                 "rasa_x_flagged": false,
>                 "rasa_x_id": 1698
>             },
>             "name": "webstatus",
>             "value": "4",
>             "is_flagged": false
>         },
>         {
>             "event": "slot",
>             "timestamp": 1610316444.2579936981,
>             "metadata": {
>                 "rasa_x_flagged": false,
>                 "rasa_x_id": 1704
>             },
>             "name": "name",
>             "value": "hello",
>             "is_flagged": false
>         },
>         {
>             "event": "action",
>             "timestamp": 1610483908.1122841835,
>             "metadata": {
>                 "rasa_x_flagged": false,
>                 "rasa_x_id": 1694
>             },
>             "name": "action_session_start",
>             "policy": null,
>             "confidence": 1,
>             "is_flagged": false
>         },
>         {
>             "event": "session_started",
>             "timestamp": 1610483908.1123051643,
>             "metadata": {
>                 "rasa_x_flagged": false,
>                 "rasa_x_id": 1695
>             },
>             "is_flagged": false
>         },
>         {
>             "event": "action",
>             "timestamp": 1610483908.1123216152,
>             "metadata": {
>                 "rasa_x_flagged": false,
>                 "rasa_x_id": 1696
>             },
>             "name": "action_listen",
>             "policy": null,
>             "confidence": null,
>             "is_flagged": false
>         },
>         {
>             "event": "user",
>             "timestamp": 1610484373.6798844337,
>             "metadata": {
>                 "rasa_x_flagged": false,
>                 "rasa_x_id": 1697
>             },
>             "text": "string",
>             "parse_data": {
>                 "intent": {},
>                 "entities": [],
>                 "text": "string",
>                 "message_id": null,
>                 "metadata": {}
>             },
>             "input_channel": null,
>             "message_id": null,
>             "is_flagged": false
>         },
>         {
>             "event": "restart",
>             "timestamp": 1610485146.07802701,
>             "metadata": {
>                 "rasa_x_flagged": false,
>                 "rasa_x_id": 1699
>             },
>             "is_flagged": false
>         },
>         {
>             "event": "restart",
>             "timestamp": 1610486176.1254849434,
>             "metadata": {
>                 "rasa_x_flagged": false,
>                 "rasa_x_id": 1701
>             },
>             "is_flagged": false
>         },
>         {
>             "event": "restart",
>             "timestamp": 1610486243.3223462105,
>             "metadata": {
>                 "rasa_x_flagged": false,
>                 "rasa_x_id": 1703
>             },
>             "is_flagged": false
>         },
>         {
>             "event": "action",
>             "timestamp": 1610486460.84983778,
>             "metadata": {
>                 "rasa_x_flagged": false,
>                 "rasa_x_id": 1705
>             },
>             "name": "action_session_start",
>             "policy": null,
>             "confidence": 1,
>             "is_flagged": false
>         },
>         {
>             "event": "session_started",
>             "timestamp": 1610486460.8498544693,
>             "metadata": {
>                 "rasa_x_flagged": false,
>                 "rasa_x_id": 1706
>             },
>             "is_flagged": false
>         },
>         {
>             "event": "action",
>             "timestamp": 1610486460.8498682976,
>             "metadata": {
>                 "rasa_x_flagged": false,
>                 "rasa_x_id": 1707
>             },
>             "name": "action_listen",
>             "policy": null,
>             "confidence": null,
>             "is_flagged": false
>         },
>         {
>             "event": "user",
>             "timestamp": 1610486460.8658306599,
>             "metadata": {
>                 "rasa_x_flagged": false,
>                 "rasa_x_id": 1708
>             },
>             "text": "gracias adios",
>             "parse_data": {
>                 "intent": {
>                     "id": 7841129470544692689,
>                     "name": "goodbye",
>                     "confidence": 0.999471128
>                 },
>                 "entities": [],
>                 "text": "gracias adios",
>                 "message_id": "5831561f457f4dbdaf62dd9d34c172a7",
>                 "metadata": {},
>                 "intent_ranking": [
>                     {
>                         "id": 7841129470544692689,
>                         "name": "goodbye",
>                         "confidence": 0.999471128
>                     },
>                     {
>                         "id": 2010416887127778773,
>                         "name": "bot_challenge",
>                         "confidence": 0.000401778
>                     },
>                     {
>                         "id": 2601533521434552815,
>                         "name": "inform",
>                         "confidence": 0.0000689154
>                     },
>                     {
>                         "id": -6690454956667738687,
>                         "name": "city_of_origin",
>                         "confidence": 0.0000293539
>                     },
>                     {
>                         "id": -4511741830055856524,
>                         "name": "cost",
>                         "confidence": 0.0000282475
>                     },
>                     {
>                         "id": 1623011401781399526,
>                         "name": "confirm",
>                         "confidence": 4.423e-7
>                     },
>                     {
>                         "id": 5334800356958836535,
>                         "name": "deny",
>                         "confidence": 1.101e-7
>                     },
>                     {
>                         "id": -3815293616266439634,
>                         "name": "greet",
>                         "confidence": 5.54e-8
>                     }
>                 ],
>                 "response_selector": {
>                     "all_retrieval_intents": [],
>                     "default": {
>                         "response": {
>                             "id": null,
>                             "response_templates": null,
>                             "confidence": 0,
>                             "intent_response_key": null,
>                             "template_name": "utter_None"
>                         },
>                         "ranking": []
>                     }
>                 }
>             },
>             "input_channel": "rasa",
>             "message_id": "5831561f457f4dbdaf62dd9d34c172a7",
>             "is_flagged": false
>         },
>         {
>             "event": "action",
>             "timestamp": 1610486460.8734741211,
>             "metadata": {
>                 "rasa_x_flagged": false,
>                 "rasa_x_id": 1709
>             },
>             "name": "utter_goodbye",
>             "policy": "policy_1_TEDPolicy",
>             "confidence": 0.5809454322,
>             "is_flagged": false
>         },
>         {
>             "event": "bot",
>             "timestamp": 1610486460.8735158443,
>             "metadata": {
>                 "template_name": "utter_goodbye",
>                 "rasa_x_flagged": false,
>                 "rasa_x_id": 1710
>             },
>             "text": "Muchas gracias por su atención y el nos estaremos comunicando con Ud.",
>             "data": {
>                 "elements": null,
>                 "quick_replies": null,
>                 "buttons": null,
>                 "attachment": null,
>                 "image": null,
>                 "custom": null
>             },
>             "is_flagged": false
>         },
>         {
>             "event": "action",
>             "timestamp": 1610486460.8810405731,
>             "metadata": {
>                 "rasa_x_flagged": false,
>                 "rasa_x_id": 1711
>             },
>             "name": "action_listen",
>             "policy": "policy_1_TEDPolicy",
>             "confidence": 0.9844363332,
>             "is_flagged": false
>         },
>         {
>             "event": "restart",
>             "timestamp": 1610486583.2911477089,
>             "metadata": {
>                 "rasa_x_flagged": false,
>                 "rasa_x_id": 1713
>             },
>             "is_flagged": false
>         },
>         {
>             "event": "action",
>             "timestamp": 1610486923.4537000656,
>             "metadata": {
>                 "rasa_x_flagged": false,
>                 "rasa_x_id": 1715
>             },
>             "name": "action_session_start",
>             "policy": null,
>             "confidence": 1,
>             "is_flagged": false
>         },
>         {
>             "event": "session_started",
>             "timestamp": 1610486923.4537160397,
>             "metadata": {
>                 "rasa_x_flagged": false,
>                 "rasa_x_id": 1716
>             },
>             "is_flagged": false
>         },
>         {
>             "event": "action",
>             "timestamp": 1610486923.4537301064,
>             "metadata": {
>                 "rasa_x_flagged": false,
>                 "rasa_x_id": 1717
>             },
>             "name": "action_listen",
>             "policy": null,
>             "confidence": null,
>             "is_flagged": false
>         },
>         {
>             "event": "action",
>             "timestamp": 1610486923.4540538788,
>             "metadata": {
>                 "rasa_x_flagged": false,
>                 "rasa_x_id": 1718
>             },
>             "name": "utter_greet",
>             "policy": null,
>             "confidence": 0,
>             "is_flagged": false
>         },
>         {
>             "event": "bot",
>             "timestamp": 1610486923.4541065693,
>             "metadata": {
>                 "template_name": "utter_greet",
>                 "rasa_x_flagged": false,
>                 "rasa_x_id": 1719
>             },
>             "text": "Muy bien profesor {name}, mi nombre es Sari Agente de OZCE Seguros, le llamo porque el Profesor Juan Manuel Ríos Ortega me pidió que le llamara, para explicarle los grandes beneficios de contar con un seguro de Gastos Médicos Mayores, que cubra el covid y otros gastos médicos más, podría hacerle unas preguntas?",
>             "data": {
>                 "elements": null,
>                 "quick_replies": null,
>                 "buttons": null,
>                 "attachment": null,
>                 "image": null,
>                 "custom": null
>             },
>             "is_flagged": false
>         },
>         {
>             "event": "restart",
>             "timestamp": 1610486942.6921339035,
>             "metadata": {
>                 "rasa_x_flagged": false,
>                 "rasa_x_id": 1720
>             },
>             "is_flagged": false
>         }
>     ],
>     "latest_input_channel": "rasa",
>     "active_loop": {},
>     "latest_action": {},
>     "latest_action_name": null
> }

The REST channel supports passing of metadata with the json payload. You can see it here. You can capture the start of the session with the action_session_start event and load your metadata (user name and other profile info) in to slots by overriding this in a custom action.

You can see an example of the custom action in this post