Play Integrity Fix magisk module fixes it. For now, anyway. I had PIF 15.1 previously and my RCS stopped working a few weeks ago. I just updated to 15.9.2 and now it’s working again. I imagine it’ll be a cat and mouse game like everything else having to do with rooted phones.
I’m not sure it was PIF. I updated PIF on my phone, but not my husband’s and RCS started working a few hours later on both
I dunno. I changed nothing else at all, updated PIF, rebooted phone, opened Messages, and like, it was immediately in rcs mode. It even received a couple old messages that has apparently been waiting on it to finally connect. Certainly possible that it was something else, maybe updating PIF happened to flush a cache somewhere, I dunno. If it wasn’t PIF directly, it was either a huge coincidence or some other indirect side effect of updating, cuz that was the only thing I touched, and it magically fixed the problem for me. ¯\_(ツ)_/¯