I am having the same issue with my S9. It will work on the first group message, then give me the "invalid address entered" error after that. I have tried in safe mode and get the same error. If I restart, the first text will work, but once someone responds, I get the error again on my next reply! I've had this phone for two years and have not had an issue until this started.
@userED8SpqbECi Please try wiping the cache partition.
My phone started giving me the error mentioned above again. Is this partition clearing method the only known fix to this issue? It has been 2 hours of working without error and then it's like a switch is flipped. That is a lot of steps to do multiple times a day.
Yeah.. This doesn't work I've had this problem since the day s9+ came out Samsung keeps denying its a problem on their end but now I have three phones that all do the same thing and it's intermittent some times it's just trying to send a picture that doesn't work but it's every time responding to group text with an iPhone in it