bluesl33ves
I installed the Google Play services from the apps app -none are beta releases. (Google Play services, framework, and Play store). I then installed the Google messages app.
These were the permissions recommended on this thread, and are the only ones I allowed
Activation of RCS worked immediately for me as per the settings detailed
GSF: Network
Play Store: Network
Messages: Phone, SMS, Network
Initially, I get what looks like a sim card and my phone number with a message saying RCS is not available. I exit that screen to complete my other settings within the app and then go back to the RCS screen and it shows activated. Guess it takes my cell network a few minutes to confirm and authorize.
Edit, set up was completed with my VPN on
I have followed this process being signed in to play store with messages downloaded from there as well as not signed in with messages downloaded fromAuroraStore - same results.