On January 10, 2023, at ~5:32 AM ET, Microsoft communicated from their Twitter account @MSFT365status that they were investigating an issue in which some users were experiencing delays in sending and receiving messages in Microsoft Teams.
For system administrators and IT professionals with access to the Microsoft admin center, the service incident number to reference was TM495986.
We're investigating an issue where some users may experience a delay in sending and receiving messages in Microsoft Teams. We're analyzing diagnostic data to isolate the root cause. Please look for TM495986 in the admin center for more details and further updates on the issue.
— Microsoft 365 Status (@MSFT365Status) January 10, 2023
Microsoft's next message, some 90 minutes later, confirmed that a "backend database issue" was the cause of the Teams messaging delays and failures, and, more importantly, this event was impacting users worldwide. Microsoft had not at this time confirmed that a fix was in place, but only that they were exploring mitigation options.
Our investigation has identified a backend database issue that is causing message delays and failures. We’re exploring mitigation options to expedite service recovery. This issue is affecting all users worldwide. Please look for TM495986 in the admin center for more details.
— Microsoft 365 Status (@MSFT365Status) January 10, 2023
And by 8:21 AM ET, approximately 3 hours after first messaging as to this issue, Microsoft was confirming that the worldwide issue had been remediated.
Impact associated with TM495986 has been remediated. Please look in the admin center for more details.
— Microsoft 365 Status (@MSFT365Status) January 10, 2023
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