Who I have the same questioned this topic

Hello all,

After I updated my phone to Android 10 I can't send group messages, status shows sending forever, no error messages.  I can receive group messages and successfully send and receive messages to individuals.  VZ support responded to my problem a few weeks ago, they had me install a debug version of Message+ and I sent them a log, never heard anything back. I removed the debug version and reinstalled the latest version from the Play Store, same issue. 

Also doesn't make a difference if I'm on the VZ network or on WiFi. Group conversations enabled, I cleared data and cache, allow all media download on mobile and WiFi.

For now I stopped using Message+ and using the stock Google messages that came with my phone.