Hi @Suman Biswas/PCH/IN/Kolkata(Office)
There was a recent Microsoft 365 service disruption starting on November 12, 2026, which affected several services, including Microsoft 365 Copilot. Some users were unable to load Copilot Chat or receive responses in the desktop and web apps.
It's being restored gradually, as for me - I'm using Copilot without any issues.
Hope this helps. Have a nice day!