Hi Sateesh,
I'm Sumit, here to answer your query at the Microsoft Community.
We will be happy to help you today. We need more details about the issue.
Are you not able to use Copilot in the sidebar? A picture says a thousand words, so if you could attach that, it would be awesome.
For web, you can use https://copilot.microsoft.com . If you hit any error, let us know.
I am eagerly awaiting your response and am committed to working with you until we reach a resolution.