It's been largely fixed for stock with select regions still being affected. RCS is failing on GOS because the correct device ID isn't getting reported and the verification services won't authenticate the OS.

It'll work for about 24 hours, give or take, from a fresh installation, but after that RCS dies and no longer works. Any groups you were in will see you as departed and you will lose any future messages to that group.

It's pretty fucked.