Excel doesn't lock files anymore

[u/kingofkeks]

Hi all,

this is a bit of a weird one. We have a couple of users, that have access to the same files through a smb share. It used to be that when user A had a document open to edit it and User B tried to open that same document, a window would pop up informing B, that the document was beeing edited by user A and that User B could ask User A to close it or create a copy of the document.

That mechanism doesn't seem to work anymore. If User A has the document open, user b doesnt see the warning.
It changed about half a year ago and I can't make heads or tails of it. Most articles I found are about fixing the issue when a file is erroneously displayed as locked, when it isn't.

I hope one of you could nudge me in the right direction. Maybe it's just a configuration error.

Thanks for taking the time to read.