Custom Copilot Engine

I have built a custom copilot agent with the help of Teams Toolkit and it is working in teams channel but when i am trying to access it through M365, it's not responding back there.

Since it is visible in copilot studio m365 as an agent but when i am trying to query then its not even hitting my bot deployed as azure web app in the backend. I am using developers preview schema in manifest.json (you can find the schema below).

 "$schema": "https://developer.microsoft.com/json-schemas/teams/vDevPreview/MicrosoftTeams.schema.json",

 "manifestVersion": "devPreview",

 "version": "1.0.2",

Could you please let me know the issue and also help on how to check logs on M365?