MS teams-DF CX Integration- Enable Calling

Hi Guys,

I have integrated Microsoft teams with Dialogflow using Azure as mentioned in the steps and Teams webchat is working fine. As a next step I would like to enable calling features for the same. I am following same steps as mentioned in the link below

https://learn.microsoft.com/en-us/microsoftteams/platform/bots/calls-and-meetings/registering-calling-bot#new-manifest-settings
And have given necessary Graph permissions. However, I am not able to achieve this.

Really appreciate some guidance or suggestion here.