tRexDestroyer
As a follow up,
I reverted back to "Setting Up..." status just a few days ago.
Today, I looked at @DirtyDan post from July 12 and installed the version mentioned there from the Aurora Store (Version 242499063).
(I'm logged into my Google Account on the phone)
When I opened up the app, it was on "Verifying..." then instantly switched to "Connecting...". So I restarted the phone as @DirtyDan instructed and when I checked again, it was Connected.
I even updated the app to latest version through Aurora Store and RCS is still connected.
In case it helps, I have all permissions enabled for Carrier Services, Play services, Play Store, and Google Messages(I used storage scopes and it still worked).