According to your steps, you grant a group role, as you said, domain admin won't be part of this group, so the behavior is correct. If you want to domain admin still with this role, you should grant the role for user and not just for group.
According to your steps, you grant a group role, as you said, domain admin won't be part of this group, so the behavior is correct. If you want to domain admin still with this role, you should grant the role for user and not just for group.