Portal - user cannot login (aadsts50105)

Question: When logging in to the portal; the user receives the message that he cannot be registered. (AADSTS50105)

Answer:
When the message below appears:



Then this is because extra security has been set up on the Mavim Portal within your environment.
A specific group has been created that has access to access the Mavim Portal; all Portal users must then be explicitly included in this group.
Therefore; you should indicate to your IT that the user in question has not been granted access to the application in Microsoft Entra ID.
The user must be part of the group that is assigned to this application (or be assigned directly).