RCS chat stuck on "setting up"

As the title reads, my RCS chat for Google Messages has been stuck on "setting up" since getting my Smarty SIM and porting my old number to it. 

There was a brief period where I had both new and old SIM cards in the phone (S22) as I needed data but also needed to be contactable while I waited for the port to finish but it's just the Smarty SIM now in slot 1.

I've tried all of the usual steps such as clearing the data for messages and carrier settings, restarting, etc but nothing seems to work. 

Any suggestions before I give up?

Thanks in advance.