Error Code:

Error Code	50105
Message	Your administrator has configured the application {appName} ('{appId}') to block users unless they are specifically granted ('assigned') access to the application. The signed in user '{user}' is blocked because they are not a direct member of a group with access, nor had access directly assigned by an administrator. Please contact your administrator to assign access to this application.
Remediation	Assign the user to the app. See https://docs.microsoft.com/azure/active-directory/manage-apps/methods-for-assigning-users-and-groups and https://docs.microsoft.com/azure/active-directory/manage-apps/application-sign-in-problem-federated-sso-gallery#user-not-assigned-a-role