Group Messaging Note 5

We have tried everything from making sure group chat functionality in messaging is on to calling T-Mobile and having them do an OTA update for messaging service. The issue with group messaging on my Note 5 started occurring after the most recent update. The message does not send it only comes back as an error message saying unable to send. All other single messages work and phone is working okay otherwise. Anyone else run in to this or other issues with the Note 5? (Cleared all cache and data for all apps and wiped cache partition already, also called Samsung but they were not helpful)