Microsoft is still apologizing for much of Microsoft 365 going down 3 days ago, but have already run into a new service degradation issue.

Microsoft has issued Exchange Advisory EX244931 warning some Users may be unable to access the Exchange Online service.

Microsoft writes:

Title: Some users may be unable to access the Exchange Online service

User Impact: Users may be unable to access the Exchange Online service.

More info: This post is a continuation of EX244931.

Current status: We’re monitoring the affected environment as we continue to restart the affected infrastructure and rerouting user traffic.

Scope of impact: Impact is specific to users hosted in Europe, Middle East, and Africa.

Next update by: Thursday, March 18, 2021, at 4:30 PM UTC

Microsoft has now updated its advisory,  revealing the underlying issues is a load-balancing issue, saying:

Title: Some users may be unable to use multiple features within the Microsoft 365 service

User Impact: Users may be unable to use multiple features within the Microsoft 365 service.

More info: This issue is an amalgamation of EX244931, EX244952, TM244945 and SP244939. This event impacts the following services:

Exchange Online – Users may be unable to use some features within Exchange Online service.

Microsoft Teams – Users may be unable to search recent messages in the search bar or see suggestions as expected when searching names within Microsoft Teams.

SharePoint Online – Users may be unable to search within SharePoint Online.

Current status: We’ve been investigating a load-balancing issue within the infrastructure responsible for Exchange Online access and search functionality. We’re rerouting traffic to alternate, healthy infrastructure to mitigate impact. In parallel, we’re restarting affected service components to bring them online and help with the load balancing operations.

Scope of impact: Impact is specific to users hosted in Europe, Middle East, and Africa.

Root cause: A load-balancing issue with the infrastructure responsible for Exchange Online access and search functionality has resulted in impact.

Next update by: Thursday, March 18, 2021, 4:30 PM (4:30 PM UTC)

Last week’s issues were due to cryptographic keys being decommissioned before the service was ready and took 14 hours to resolve. Hopefully, on this occasion, the issue will be resolved faster.

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