Azure SAML configuration: How can I resolve Error AADSTS50105 in an Azure configuration?

[MalcolmDavidson]

If you receive the message "Error AADSTS50105 - The signed in user is not assigned to a role for the application" during federated authentication with Azure Active Directory (Azure AD), it indicates that the user hasn't been granted access to the application in Azure AD.

For details, see the Microsoft documentation:

• Error AADSTS50105 - The signed in user is not assigned to a role for the application 
• Quickstart: Create and assign a user account