A Microsoft file hosting and synchronization service.
I had the user try in incognito mode and they got prompted to login and then access denied after logging in. I would expect access denied as the external account does not have access. The issue is they should not be getting prompted to login to an Anyone link.
I am sharing as an anyone link, the result is a prompt to login and access denied.
No expiration date is set on the link.
This is a standard action of opening OneDrive, get a link as Anyone with the link can edit and share it via email. The user is then prompted to login, which should not be happening.