Null when FindByNameAsync, it needs NormalizedUserName mapped

[EduardRotaru]

     CreateMap<MemberModel, AppUser>()
            .ForMember(m => m.NormalizedUserName, opt => {
                opt.MapFrom(c => c.Username.ToUpper());
            });

This is needed because when editing roles:

var user = await _userManager.FindByNameAsync(username); <- its null

This will break since usermanager looks internally for the normalized username. At least for me, but if others encounter user null is because of this problem.