SharePoint Online Document Library Check In/Check out - wont allow check out by a subsequent user

Question

We have a document library on SharePoint Online that is set to require check in/ check out.

User 1 and User 2 have Full Control Permissions on the Site and Library.

User 1 uploads a new document and checks it in with comments. Document Shows as being checked in

Moments later User 2 selects document, clicks "...", then selects "More", then selects "Check out" then gets error:

The file "https://file url/file name.docx" is not checked out.

We tried for 20+ minutes and the file is unable to be checked out by any other user other than the the original user who created the document.

User 1 is able to go back in and check out and in with no issues but no other user can check out document.

We confirmed permissions are set to Full Control for each user trying to check out (just for testing as contribute or edit didn't work so we set to Full Control, not usual practice)

We can see the version history of User 1 upload, and check in, but nothing subsequent.

Why would this be happening?

Answer 1

I have tested the situation you provided and check in/check out feature works well in my document library.

Generally, such issue may happen due to unexpected closing of the file and the file cache is still stored in system or browser showing the file is still in use. 

Please check the following tips and share the result.

1.Go to Library Settings -> Manage files which have no checked in versions under Permissions and Management -> Check whether the file is there.

2.Check whether the file is shared, other users open it and don’t close it. If yes, let them close it and re-sign into the site library to do a test.

3.Clear the browser cache or use another browser to test.

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