Btw, I got this error after coming back to Canada, and deactivating my eSIM. Had to do the following:Settings > General > Transfer or Reset iPhone > Reset > Reset All Settings.
Did you find a solution? I'm on iPhone 11 and suddenly, group chats with Anroid users can't receive photos and give the error "cannot send message mms messaging needs to be enabled to send this message iphone to android group", and anyone replying go...
