Microsoft SSO in not working in teams-bot task module

I have implemented MS SSO Authentication in my teams tab and it is working nicely in tab and messaging extensions but when I implemented same in teams-bot task module it is not working and giving error.

https://docs.microsoft.com/en-us/microsoftteams/platform/tabs/how-to/authentication/auth-aad-sso

As per this doc, it should work in task modules as well but I'm getting below error.

"ExtensionTabService: getAuthTokenForApp: Failed with error - Definition not found"