Exchange not working

Good day Liz and I’m sorry to hear about the difficulties you’re experiencing.  

There is currently a known Exchange Online service incident, EX1464935. Due to an authentication service issue, users may experience delays or failures when sending or receiving email, authentication errors, mailbox access issues, or other Exchange Online service degradation. At this time, no additional troubleshooting is required on your side. 

I recommend that your IT administrator monitor incident EX1464935 in the Microsoft 365 admin center > Service Health for the latest updates, as Microsoft is actively working on a resolution.

Note: In case you do not know who is your IT admin, kindly refer to this article: How do I find my Microsoft 365 admin? - Microsoft Support  

After Microsoft confirms service restoration, please sign out and sign back in to Outlook app or Outlook on the web, then verify that email delivery has returned to normal. 

Also, as many members of the community may not yet be aware of this incident, I hope you find this information helpful. Sharing or highlighting this response can help bring greater visibility to the issue, making it easier for others who are experiencing similar challenges to find relevant information and support.   

I hope this provides enough clarity and helps you stay inform with your current situation. If you have any questions or need further assistance, please feel free to share them in the comments on this post so I can continue to support you.    

Thank you for your patience and understanding.   

If the answer is helpful, please click "Yes" and kindly upvote it. If you have any extra questions about this answer, please click "Comment".            

Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.