Rasa telegram

Hi, im having an issue with rasa telegram integration. Im using ngrok and I type http 4040 , i copy the forwarding address and paste it in the webhook_URL . Then I run rasa with enabled api on port 4040. After sending messages into my telegram bot I get 404 not found webhooks/telegram/webhook. The problem must be with ngrok and it’s setup. Can anyone tell me how to resolve this issue ?