AADSTS50105 The signed in user is not assigned to a role for the application

The Azure SSO application created for Arctera Unified Platform portals is not assigned to the user who is attempting to login.
1. Login to the Azure AD Admin Center using Microsoft Admin Center.
2. Navigate to Enterprise Applications and lookup the application created for Arctera Unified Platform.
3. Click on Users and Groups > Add User.
4. Add the user account getting this error and save the configuration.
Login attempt to Arctera Unified Platform portals using Azure AD SSO fails with error : AADSTS50105 The signed in user is not assigned to a role of the application