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I just started having the same issue. I used Textra because the Message+ app drained my battery too much and have not had a problem till today. What I can gather is Message+ has an "enhanced group messaging", which isn't clearly called out that it may cause other people issues who don't have Message+. I received a text message from Verizon like you did saying that I had group messages waiting for me, and that I needed to download Message+. I too can't see the group message in a 3rd party app, which likely is meant to be that way by Verizon. If someone else starts a group text outside of that app, then the group message remains to be a standard group message, but something about it being enhanced when made in the Message+ app makes stay inside that app ONLY. Verizon probably just made their app to be like iMessage where only other iMessage people can get them. It will be up to the Verizon app folks to make those enhanced group messages be backwards compatible to non enhanced apps.
