Edge sidebar M365 Copilot shows empty Chats list, but full tab and phone show history

Create a new Edge profile with the same work account; if Copilot history loads there, reset the original profile’s settings, and if it fails there too, escalate through your Microsoft 365 administrator.

1. Test a clean Edge profile

This is the most useful remaining test because the history works in the full tab and on mobile, while restart, repair, cookies, sidebar settings, and relevant policies have already been ruled out.

1. In Edge, select the profile icon.
2. Select Add profile → Add.
3. Sign in with the same work account.
4. Open the Microsoft 365 Copilot sidebar.
5. Check whether Chats populates and an existing conversation opens.

Microsoft’s Edge guidance uses a new profile to distinguish profile-local corruption or conflicting settings from account/service problems.^1^

2. If the new profile works

The original Edge profile has a local state or authentication-context problem.

Use the safer reset before removing the profile:

1. In the original profile, open edge://settings/reset.
2. Select Restore settings to their default values.
3. Restart Edge and test the sidebar again.

This resets the startup page, new-tab page, search engine, and pinned tabs; disables extensions; and clears temporary data such as cookies. It does not remove favorites, history, or saved passwords.^1^

If resetting does not help, either continue using the new profile or remove and recreate the original profile. Before removing it, verify that required favorites and passwords are synchronized, because unsynchronized local profile data can be deleted.^2^

3. If the new profile also fails

Treat this as a sidebar authentication, endpoint, or tenant-service issue rather than damaged chat history.

1. Refresh the Edge authentication context: sign out of the Edge profile, sign back in with the work account, and reopen the sidebar. Microsoft documents that sidebar sign-in or retry failures occur when Edge cannot obtain a valid authentication token for the profile.^3^
2. Ask your Microsoft 365 administrator to check Microsoft 365 admin center → Health → Service health for a Copilot or Microsoft 365 advisory.
3. If no advisory applies, have the administrator open a service request under Help & support. Work-account Copilot issues that persist across profiles require tenant-side investigation.^4^

Include:

• Exact Edge version: 155.0.4283.62
• Windows version from Settings → System → About
• Approximate date and time the problem began
• Screenshot of the empty Chats list and error
• Export from edge://policy
• Screenshot of edge://settings/appearance/copilotAndSidebar
• Result of the new-profile test
• The fact that the same work account’s history works in a full tab and on mobile

Microsoft specifically recommends collecting the Edge version, policies, sidebar settings, account type, and OS version for support escalation.^1^

Version status

Microsoft’s current Edge known-issues page does not list an empty Microsoft 365 Copilot Chats list as a tracked Edge 155 issue. The listed version 155 issue concerns some existing profiles being unable to launch Edge, which does not match this symptom.^5^

Your version is also newer than the minimum 146.0.3856.117 required for Microsoft 365 Copilot Chat in the sidebar. Since edge://policy shows no sidebar blocking policy, the Edge 146+ internal-URL allow-list fix does not apply here.^5^

Continue using the full-tab experience while the sidebar is investigated; the cross-device result indicates that the conversations remain available to the account.

References

1. Copilot icon doesn't appear in Microsoft Edge sidebar
2. Troubleshoot common sign-in problems
3. Fix Copilot Chat loading issues in Edge Sidebar - Microsoft Edge
4. Copilot aparentemente não recuperando contexto ou "lembrando" informações da mesma maneira que antes. - Microsoft Q&A
5. Microsoft Edge known issues | Microsoft Learn