Got the new GOS update last night and RCS still not working with my Pixel 9a on T-Mobile. It used to work, then, about a month ago, it stopped working with a green CONNECTED message (even though it would only send texts instead of RCS messages). Now, the status message says:
"Trouble connecting. Awaiting retry..."
and under Details it says:
"Status code: 3200
Status details: Please wait, activation is ongoing"
It's waiting 24 hours before retrying.
Regarding permissions, Messages has everything except Location and is the default SMS app, Google Play Services has Contacts, Network, Notifications, Phone, Sensors and SMS; and Carrier Services is installed with Network, Phone and Sensors. Everything's the same as when it used to work about a month ago.