And that is exactly the problem.
I have just sent out messages to two Teams most affected by this problem and we're going to back up and running. Nice way to run a railroad as usual, sigh. Disqus...seriously?
If I didn't need it to communicate with Teams, I'd turn that silly thing off!
THANK YOU, Mazza. Naturally I have credited you for this saving piece of information as none of us caught this one and were relying heavily on the poor chat box!