Found the issue. It was in Bearer token: it was taken from a file and it ended with a crlf char.
Removed that char solved the issue.
Probably Microsoft changes something on their side
I've developed an application to use graph api to authenticate over AAD.
It worked for months but now it returns me "StatusCode: BadRequest - Reason: Bad Request"
Where can I see which is the problem with my request?
On client application side I have no more informations on this error.
Application has been developed with these steps:
Token is then passed to another application that perform another request (GetHttpContentWithToken (copied from example)) with scopes "user.read"