Here is the statement from the Microsoft OneDrive product group (Redmond USA) about the OneDrive Personal problem:
***This is related to a backend migration we are doing and unfortunately, we don’t fully support syncing shared folders in the case where one user has migrated and the other has not. We’re doing everything possible to accelerate things so that it can be resolved as soon as possible for users of the feature. When the accounts are migrated, there is automated logic that makes them go back to a syncing folder within several days.***I have heard, that shared Folder issue is gone.
The best thing is: WAIT and do nothing
So... Wait and pray the feature one day works? After a week? A month? A year? Never?
I'd assume that without a timeframe some people will be forced to cancel the renewal of their subscriptions.
Others, like me, should not follow this advice but change the way they work, if possible, to not rely on those shares and have data completely segregated. It is bad OneDrive won't allow more than one account to sync on the same logon and that Microsoft throttles third party software heavily, otherwise we could probably use it.
Thanks a lot for the information, of course. It's surely WAY better than anything and very sensible.
Knowing there won't be a solution we can rely on is, somehow, a solution to the question, even if the problem might not be solved for another two years...
🙏🏻