I‘m Stephan and sinc yesterday I have exact the same problem as Aaron described.
My core is on a Synology NAS, remote works with my IPad.
Yes, there is a button to inauthorize from the core. I can push it and get a notice the system is working, but this has no effect.
No access to core.
I‘m afraid we are not alone with this thing.
Something seems to have changed in the software itself or in it´s surroundings.
Looking forward for help.
Thanks a lot
Best regards Stephan