Posting the Answer for better visibility
Copying from @Danstan comments
OAuth scope is not reflected
I have a question about Microsoft Graph.
I would like to retrieve the details of a meeting held in Teams using the API.
I have specified User.ReadWrite and OnlineMeetings.ReadWrite in the code as the OAuth scope.
However, when I look at the response when obtaining the access token, OnlineMeetings.ReadWrite is not reflected (it does not even appear in the consent screen).
What are the possible causes and solutions?