So Pro and I are having a little dispute:
At first, it seems that Pro 2.2.1 won't take no for an answer. Then it won't take yes. Perhaps we've reached the point in our relationship where arguments like this are the norm. How will Pro react if I go back to my ex for a while (still have Arc Maps digits in my phone...)?
Fo' real though, I can't be the first to see this? AGOL hosted feature service, offline-capable, nothing out of "spec" here. After some combination of the yes no argument, it always get's the edit fail error (despite no other process accessing the mobile geodatabase), and of course fails to sync. Happens with random points, and after random iterations of us screaming yes and no to each other.