If you want to make your environment more secure, it's recommended to disable Legacy Authentication in Microsoft 365. Check this post to know how to do the same.
18hon MSN
No escape: Microsoft flatlines Office Online Server — it's now Microsoft 365 cloud or nothing
Microsoft is officially ending support for Office Online Server on December 31, 2026, marking the end of its self-hosted ...
Microsoft is investigating an ongoing incident that is preventing some customers from accessing Microsoft 365 applications.
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