Co Pilot not working.

Because Copilot is blank in the Windows app and multiple browsers, test the Copilot service connection from the affected PC rather than repeating the repair, reset, reinstall, restart, or generic troubleshooting steps already completed.

1. Test the Copilot endpoint

Open this address directly in a normal browser tab:

https://edgeservices.bing.com/edgesvc/shell

• If it does not load or displays a network/blocking error: a firewall, proxy, VPN, DNS filter, security product, or managed network policy is likely preventing the connection.
• If it loads: continue to the account/session checks below.

Microsoft specifically documents this endpoint test for a blank Copilot pane. For work or school accounts, Copilot may use a configurable MetaOS endpoint instead, so an administrator may need to identify and test that endpoint.^1^

2. Isolate the network

Connect the PC temporarily to a different network, such as a mobile hotspot, and open Copilot again.

• Works on the hotspot: the normal router, DNS service, proxy, VPN, firewall, web filter, or TLS inspection is blocking Copilot.
• Still white on the hotspot: proceed to the account and cookie tests.

If a VPN or third-party web-protection feature is active, disable it only for this test. On an organization-managed device, ask IT to verify that:

• *.cloud.microsoft and the required Microsoft Copilot endpoints are allowed.
• Secure WebSocket connections are permitted to *.office.com, *.cloud.microsoft, and copilot.cloud.microsoft.
• Proxy or firewall policies, Conditional Access, tenant restrictions, app-control policies, and TLS inspection are not interfering with Copilot.^2^

Do not permanently weaken firewall or security controls; use allow-list rules for the required Microsoft endpoints.

3. Separate an account problem from a PC problem

1. Open a private/InPrivate browser window.
2. Go to copilot.microsoft.com.
3. Sign in with the Microsoft account normally used for Copilot.
4. If another eligible account is available, test it separately.

Microsoft notes that personal accounts can move to the updated Copilot experience at different times; redirection to the updated site can therefore differ by account.^3^

Interpret the result:

• Another account works on this PC: the issue is associated with the original account, its eligibility, or its authentication session.
• Neither account works, but Copilot works on another device/network: the problem is local to this PC.
• The same account fails on another device and another network: report it as an account/service issue.

Child-classified Microsoft accounts cannot use Copilot. Copilot in the Edge sidebar also requires a supported desktop edition of Windows and is not available inside PWA or Web App windows.^1^

4. If only browser access remains broken

Enable third-party cookies temporarily and retest, because blocked third-party cookies can prevent Copilot license validation:

• Edge: Settings and more → Settings → Cookies and site permissions → Manage and delete cookies and site data → Block third-party cookies: Off
• Chrome: Settings → Privacy and security → Allow third-party cookies
• Firefox: Settings → Privacy & Security → Enhanced Tracking Protection → Custom, then clear the Cookies checkbox.^4^

If that resolves it, re-enable blocking and create the narrowest permitted site exception rather than leaving all third-party cookies enabled.

5. Managed Edge devices only

If this is a work-managed PC, open edge://policy and inspect EdgeSidebarAppUrlHostBlockList. If its value is *, IT must add the documented Copilot internal URLs to EdgeSidebarAppUrlHostAllowList; Edge 146 and later require additional entries. This branch applies only when that wildcard policy is present.^1^

If the endpoint loads, another network and account make no difference, and cookies are not blocking access, report the issue from Copilot using … → Send feedback → Report a problem. Include when it began, the Windows version, whether the endpoint loaded, the network/account test results, and a screenshot.^3^

References

1. Fix Copilot Chat loading issues in Edge Sidebar - Microsoft Edge
2. Microsoft Copilot requirements
3. Troubleshoot Your Content in the Updated Copilot App | Microsoft Support
4. I am getting license validation errors with Copilot | Microsoft Support