Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Hello,sandip_kar
Welcome to the Microsoft community!
I have realized that your issues.
I apologize for the inconvenience, I searched for content based on your question and found that you are not the only one experiencing this issue.
There are a lot of users also feedback this problem.
It can't be ruled out at this point that Copilot is doing maintenance or some other update that is causing this.
The only thing you can do at the moment is to clear the cache or reinstall the software, and wait for a subsequent fix after that.
Are you having the same problem with the web side of your Copilot?
https://copilot.microsoft.com/
You can try to give feedback on the issue
Providing feedback about Microsoft Copilot with Microsoft 365 apps - Microsoft Support
Due to your privacy and security and in order to comply with the community rules, Microsoft community members are not able to provide you with remote support, you can contact Microsoft support to check your system condition.
Contact Microsoft Support.
- Visit this website: Contact - Microsoft Support
- Type in your problems in the search box there. For instance, subscription/Tax invoices/refund, etc.
- Now click Get help, and Select Contact Support below.
- Go to the Products and services tab, and choose either Microsoft 365 and Office category or Other Products
- On the Category tab, choose Manage My Subscription or other alternatives.
- Go to Confirm.
- You can now choose the option of Chat with a support agent on your web browser.
Please Note: The Chat support team only works at certain times, so if the last window says you are not available, try to open it again the next day. If you prefer phone support, you can leave a phone number.
That way, they can call you and help you.
Feel free to post back if you need further assistance.
Thank you for your understanding and patience and I look forward to hearing from you.
Ryan - MSFT | Microsoft Community Support Specialist