I have been practicing regularly for the past 3 weeks or so, and my 10 yr old DD has caught on the last week as well.
I have been successful daily with the App already open and a 3 second wait after 8am. Time tracking is via Atomic Clock Widget that has a floating small window over the
MDE App.
Today is the first time it did not work for both of us. No Red "Join Boarding Group".
Was thrown off, clicked My Status, and was able to click "Join A Boarding Group"
In a way, I am glad this happened so I am prepared for various issues that may arise when in the Park on Go Live Day and how to handle them, and just not freeze up and not know what to do.
It does appear that today, more then other days, that a lot of folks encountered the same issue of the Join Boarding Group not turning Red.
BTW, at approx 8:54 (or so) Back Up Boarding Groups were finally filled. Nobody wants to leave the 5 hr line @ MMRR.