iMessage group chat only sending at SMS

I’m in a group chat with entirely iPhones and for the last 6 months it has been fine texting as iMessage. I updated my phone and now I can’t send anything from my phone at iMessage, only SMS. This is the only group chat it’s happening to. I can send iMessage from my laptop to the same group chat. I’ve tried having someone remove me and re-add me to no avail.