In this video tutorial from Microsoft, you will receive an overview on how to troubleshoot issues with an invalidated PRT or missing PRT. A PRT is invalidated in the following scenarios: Invalid user: If a user is deleted or disabled in Azure AD, their PRT is invalidated and can't be used to obtain tokens for applications.

Azure Active Directory is now Microsoft Entra ID, all other Azure Active Directory branded products are now “Microsoft Entra”. Any reference to Azure Active Directory within this video should be replaced with Microsoft Entra or Microsoft Entra ID as applicable.