Create a Teams calendar event from a bot

Nikitha-MSFT Thanks for your response.

I have some doubts, please correct what I write below if required:

As far as I understand, I can use Application permission to create an event, so I will access Graph without a user (https://docs.microsoft.com/en-us/graph/auth-v2-service)

I will use 'POST /users/{id}/events', where the {id} must be Teams userId (what I get in 'activity.from.id' of an incoming command), and not the Office365/Azure id.

'Bearer' header is required, so I need a token. I have running code to get Teams users, and previously I get a bearer token with this options:

var options = {
    uri: 'https://login.microsoftonline.com/{tenant ID}/oauth2/v2.0/token',
    method: 'POST',
    headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
    body: 'client_id=' + {appId} + '&client_secret=' + {appPassword} + '&scope=https%3A%2F%2Fgraph.microsoft.com%2F.default&grant_type=client_credentials',
};

With the token received in the response, I can access to the users in a Teams group:
      https://graph.microsoft.com/v1.0/groups/{groupID}/members

Can I use this token (for my application) to create an event for a user from the bot?

With a userId = '29:184h5dKIrOfsVklZrZyWMe91Gio.....nNQiCqFNLreLIEq-YC' I have tried this PUT:
      https://graph.microsoft.com/v1.0/users/{userId}/calendar/events
      and the previous Authentication bearer token
      with an example event as body

but I get a '500 Internal Server Error' as response.

What am I doing wrong?

Thanks a lot,

Diego