Syberkonda
Hello everyone! I had made an account to report my findings. It seems my RCS on Google Messages stopped working around the same time as most people in this thread. I had followed a couple people's suggestions here and no avail. I decided to give Syberkonda's post a try and it actually worked! I followed the post pretty much to a 'T' but instead of grabbing the APK from apkmirror, I used Aurora store and the version code that's listed under the app variants. I matched my CPU architecture, went with the nodpi, openbeta build; version code: 52051140. After that, I followed the steps normally.
I am using a Pixel 7 on AT&T with the latest build. So instead of the Verizon ACS URL, I used "https://rcs-acs-att-us.jibe.google.com". It connected pretty much instantly and I was able to update the app with Aurora afterwards and still keep RCS connected.
Edit: I forgot to mention, I do not have carrier services installed.