Mar 1, 12:14 CST
Investigating – Title: Users may be unable to access their Exchange Online mailbox or send/receive messages
User impact: Users may be unable to access their Exchange Online mailboxes or send and receive email messages.
More info: Users may receive an error message including: “550 5.4.1 Recipient address rejected: Access denied” when attempting to send or receive messages.
Current status: We’ve identified a potential Directory Based Edge Blocking (DBEB) issue that may be contributing to impact. We’re investigating this alongside our existing diagnostic data to determine our next steps.
Scope of impact: Impact is specific to users who are served through the affected infrastructure in North America, Europe, and the United Kingdom.
Start time: Wednesday, March 1, 2023, 7:11 AM (1:11 PM UTC)
Next update by: Wednesday, March 1, 2023, 12:30 PM (6:30 PM UTC)