Hmm… I'm running 2.2.1 and not seeing this.
I know it sounds dumb, but I've done it a hundred times before... Have you gone to User Manager > Settings and changed it from Local Database to your DC on the backup firewall? Gets me every time since it's not a replicated setting that I'm aware of.
Most bizarre thing, it's working now and I've literally changed nothing. And it's been broken for weeks.
Just chalk it up to a gremlin?