Welcome! This forum has a treasure trove of great info – Scouters helping Scouters! Just a heads up, though - all content, information, and opinions shared on this forum are those of the author, not the BSA.
This is also happening to me. I will tell you that it seems the messages are still getting sent and received as I received a message this afternoon even though it says messaging opt out next to my name. I am hoping this is just a display issue and a easy fix.
Update: The one person who actually has opted out of receiving messages is now the only person not showing as having opted out in the calendar. Previously everyone was showing as having opted out; now it’s showing it as opposite of what it should (i.e., the warning is displayed for those who have not opted out of messages and no warning is displayed for those who have actually opted out of messages).
(Yes, I know this is already a known bug - I am provide a new detail to hopefully help the developers track down and fully resolve the issue.)