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Hi @BunnyNoBugs,
I am pretty unexperienced with RASA and therefore I simply followed the instructions provided int the Udemy RASA Developer course.
Maybe it helps you? The steps were:

  1. Install the desktop app of Telegram and follow the instructions provided by Rasa here
  2. Add the Telegram credentials to your credentials.yml (see description in link above)
  3. start the RASA server rasa run when rasa is up and running, then
  4. start ngrok in another terminal window ngrok http 5005
  5. add the ngrok-URL to your credentials.yml Telegram webhook URL and save the file
  6. restart the RASA server so changes in the credentials.yml get picked up with /stop or CTR+C and rasa run
  7. make sure your action server is running

Futhermore, I added the intent start to my domain.yml, in the nlu.yml I provided the example

- intent: start
  examples: |
    - /start
    - start

and in the rule in rules.yml:

- rule: Greet the user in Telegram
  steps:
  - intent: start
  - action: utter_greet

I hope this will help you.
Ciao, Vio