Hi Jeet,
Thank you for posting your query in Microsoft Community.
I understand your concern regarding the issue that you are facing.
would suggest you to follow below mentioned steps and check if that helps:
Remove Trusted Devices for your Microsoft Account in More security settings.
1. Switch back to local account and remove all trusted devices (in More security settings).
2. check if you are offline from the Windows store app
3. return to device list (Microsoft account site) and check if the problem is solved.
4. switch your local account into a Microsoft account and trust this pc using phone, sms or email.
5. Use Windows Store to download a free game (just to test) and return one more time to device list and check if the problem is solved.
For more information you may refer to the below mentioned Microsoft article:
http://windows.microsoft.com/en-us/windows/what-is-trusted-device
If the issue still persists, check it in In-private browsing. Type ctrl+alt+P to open in-private browser.
You can also run the Microsoft Account troubleshooter.
The Microsoft Account Troubleshooter scans a Windows 10 system for issues and repairs problems that are found in relation to your Microsoft Account.
http://download.microsoft.com/download/F/2/4/F24D0C03-4181-4E5B-A23B-5C3A6B5974E3/microsoftaccounts.diagcab
Hope this information is helpful. Please write back to us if you need any further assistance, we'll be glad to assist you.