Thank you - I'm glad to hear there is a way, though I think I'll leave the registry setting for now, but bear it in mind - haven't a lot of time for fiddling around right now.
Yes, I too have had no problems with dual monitors - although I do still have Teams installed.
It's my single screen independent laptop that won't play the game. It would be really good if Microsoft decided to come clean on this and tell us their future plans. I installed in December, and it's already nearing the end of September. Surely that's long enough to wait for an answer.