Reasonable people would've accepted that fine. And you don't have to worry about unreasonable people, because most people will find them unreasonable and dismiss anything they say.
And communicating [situation], [action(s)], [how this affects you] is one of the most basic professional communication skills you could imagine.
No, reasonable people would not have accepted "we're unilaterally deciding to lock you out with no advance notice, over something we could and should have been discussing for many months or years, but instead screwed up so badly that we're doing it ten minutes from now".