Rasa 3.6.21 on Google Chat

I have installed Rasa 3.6.21 on Ubuntu 24.04.2 LTS. I have setup an apache2 proxy to an existing sub-domain rasa.mydomain.com. The proxy setting is done like below: ProxyPreserveHost On ProxyPass / http://localhost:5005/ ProxyPassReverse / http://localhost:5005/

I connected the chatbot on Google Chat. The project was created in GCP, Google Chat API is enabled. I chose ‘HTTP endpoint URL’ in connection settings and entered URL https://rasa.mydomain.com/webhooks/hangouts/webhook in HTTP endpoint URL field. All other configurations are standard.

I added below entry in credentials.yml: hangouts: type: hangouts verify: true project_id: “rasa36”

When I type hello in Google Chat, I get a response that chatbot is not responding. The Apache access log show the below log: 74.125.214.100 - - [05/Apr/2025:14:29:40 +0530] “POST /webhooks/hangouts/webhook HTTP/1.1” 401 6231 “-” “Google-Dynamite” Please help me what mistake I may have done or what may I have missed?

Regards, Rajesh