Token for Microsoft Graph Expires


i had migrated a custom app (new FDK version) which use the MS Graph API.
Before, everything seems to be ok.

Now i run into a little problem:

The token expires and i get a 403. How can i get a new token.

Must i reauthenticate?, if yes, how can i do this?
Or can i call some refresh token function which is build in?

For now, i can reinstall the app. So i can reauthenticate and it works again for some time.

Thanks, Stefan

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