I am getting below error while calling simple graph api from explorer.

https://graph.microsoft.com/v1.0/chats/FEAIj3m6uofGd-3BQ/messages

Even though i have given all the permissions highlighted by Graph Explorer

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I have taken reference of No authorization information present on Microsoft Graph API request

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The issue might be due there is no admin grant for the above permissions as seen below:

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You can also decode your token in https://jwt.ms/ and check in scopes whether the required permissions are available.

Hope this helps.