[Flutter] How to get a valid RS256 token from Azure in a Flutter app?

I'm doing a Flutter app for iOS and Android, and I need to use authentification to access to the main content.

For that I used this pubdev package(aad_oauth), and it works very well. I need to get the token provided by Azure to send it to my API to authenticate my user.

I used this method :

var token = await oauth.getAccessToken();


But the token is considered invalid even by my API then by https://jwt.io/ with the error "invalid signature" but works in the Flutter app.

Here is a censored screen of jwt.io :



Did someone knows how to get a valid token to send it after ?

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