I’m using n8n docker and I have the same problem, I use Telegram nodes normally, however, when I need to use trigger I get this error.
Telegram Trigger: 400 - {“ok”:false,“error_code”:400,“description”:“Bad Request: bad webhook: An HTTPS URL must be provided for webhook”} - Bad Request: bad webhook: An HTTPS URL must be provided for webhook
Not sure why but on mine right below Parameters is Webhooks. Yours is missing. You also have a clue in the error: “An HTTPS URL must be provided for webhook”. Did you specify in Docker the webhook domain? It’ll have to have an SSL cert and be httpS://yourdomain.com/