You click to switch Copilot from your personal account to your work account, and nothing happens. Or it appears to switch, then quietly reverts to the old account on the next launch. Or it signs you into an account you never chose, mixing work chats with personal ones. Account switching should be a two-click job, but when sessions stick, it becomes a daily frustration.

The root problem is that Copilot does not live in isolation. It shares sign-in state with Windows, Edge, and your Microsoft account services, so a cached session in any of those places can pull Copilot back to the previous account. Organisation policies add another layer: a managed work device may restrict which accounts Copilot can use at all. Understanding which layer is holding the old account is the key to fixing it.

This guide separates the layers one by one. You will first confirm which account Copilot is actually using, then clear the sticky session, then deal with Windows-level account settings, and finally handle managed-device restrictions. If your Copilot refuses to sign in at all rather than switching, the companion guide on Copilot in Excel not working is less relevant than a straight sign-in repair, but the account steps here still apply.

Why this happens

  • Cached session overriding your choice: A stored token for the old account can re-authenticate Copilot automatically, undoing a manual switch within seconds or on the next launch.
  • Windows account linkage: Copilot often defaults to the Microsoft account signed into Windows itself, so switching inside Copilot alone may not be enough.
  • Edge profile carrying the old sign-in: Because Copilot shares web sign-in state with Edge, an Edge profile signed into the old account can pull Copilot back.
  • Organisation or MDM policy: Work devices managed by Intune or group policy may pin Copilot to a work account and block personal accounts entirely.
  • Corrupted Copilot app data: Damaged local data can leave the sign-in screen stuck, greyed out, or looping between accounts.
  • Multiple accounts with similar names: When two accounts share a name or avatar, it is easy to switch to the wrong one and conclude that switching itself failed.

How to fix it

Work through these in order — diagnose first, then act.

Fix 1: Confirm which account Copilot is actually using

Guessing at the account wastes time, so verify the active account before changing anything else.

  1. Open Copilot and look at the profile icon or account area to read the signed-in email address carefully.
  2. Compare that address with the account you intended to use, checking for lookalike personal and work addresses.
  3. Ask Copilot a question and note whether work documents or personal history appear in the results.
  4. Close and reopen Copilot, then check the account again to see whether it reverts on relaunch.
  5. If the account changes back on its own, a cached session is the likely cause, and the next fix targets it directly.

Fix 2: Sign out fully and sign in with the right account

A partial switch leaves the old session alive, so a complete sign-out is the cleanest way to break the stickiness.

  1. In Copilot, sign out of the current account completely rather than merely closing the app.
  2. Close Copilot, then open Edge and sign out of the same old account there as well.
  3. Reopen Copilot and choose to sign in, entering the exact email address of the account you want.
  4. Complete any verification prompt, then confirm the profile area shows the intended address.
  5. Restart Copilot once more and recheck the account to confirm the switch has actually stuck.

Fix 3: Remove the old account from Windows account settings

If Copilot keeps defaulting to a Windows-linked account, remove that link at the system level.

  1. Open Windows Settings, go to Accounts, and review Email and accounts for every account listed.
  2. Identify the old account that Copilot keeps reverting to, and remove it from Windows if you no longer need it there.
  3. If you still need that account for email, keep it in your mail app but remove it from the Windows sign-in list.
  4. Return to Copilot, sign out and sign in again with the intended account, and test the switch.
  5. Remember that removing an account from Windows can affect other apps, so only remove accounts you recognise and can re-add later.

Fix 4: Clear Copilot app data and browser sign-in state

When the app itself holds corrupted session data, clearing it forces a genuinely fresh sign-in.

  1. Go to Settings, then Apps, then Installed apps, and find Microsoft Copilot in the list.
  2. Open Advanced options and click Repair first, then test whether switching now works.
  3. If it does not, return and click Reset to clear all local Copilot data and cached sessions.
  4. In Edge, clear cookies for Microsoft sign-in sites if Copilot still pulls the old account after the reset.
  5. Reopen Copilot, sign in with the intended account, and verify the switch survives a restart.

Fix 5: Check for organisation policy and a managed device

Managed devices can legitimately block account switching, and no amount of local resetting will override a policy.

  1. Check whether your laptop is work-managed by looking for organisation messages in Windows Settings.
  2. Ask your IT administrator whether Copilot account switching is restricted on your device.
  3. If a policy pins Copilot to a work account, use the work account in Copilot and keep personal chats in a browser session instead.
  4. On a personal device, check Settings for any work or school account that was added accidentally and remove it.
  5. If the device is unmanaged but switching is still blocked, move to a clean reinstall, since a policy is then unlikely to be the cause.

Fix 6: Reinstall Copilot and set a clean default account

A fresh install removes the deepest session damage and lets you establish the correct account from scratch.

  1. Uninstall Microsoft Copilot from Settings, then restart your laptop to clear locked session files.
  2. Reinstall Copilot from the Microsoft Store, but do not sign in immediately on first launch.
  3. First confirm that Windows itself is signed into the account you want Copilot to default to.
  4. Sign into Copilot with that same account, verify the profile address, and test switching once.
  5. Going forward, switch accounts only through Copilot’s profile menu, and avoid signing into Edge with a different account mid-session.

Closing

Account switching fails most often because a cached session, a Windows account link, or a work policy silently overrules your choice — and the fixes above address those layers in order. Sign out fully, clean the Windows and Edge links, reset the app if needed, and respect a genuine management policy when one exists. Similar sticky-state problems show up elsewhere on AI PCs, from an antivirus ARM Windows compatibility clash that blocks sign-in services to an MSI Summit 13 AI issue that looks like an app fault but stems from the device platform. For official account and Windows guidance, Microsoft’s Windows support hub remains the safest reference.

Frequently asked questions

Why does Copilot keep opening with the wrong account?
Copilot usually opens with the account Windows last used for it, and a stale or cached session can override your new choice. If the previous account is still signed in elsewhere in Windows or Edge, Copilot may silently reuse it. Signing out fully and clearing the cached session normally breaks that loop.
Can I use a personal and a work account in Copilot at the same time?
Copilot supports one active account at a time in a single session, so you switch rather than run both side by side. You can keep both accounts added to Windows and switch between them, but chats, history, and Copilot features follow whichever account is currently active.
Does switching accounts delete my Copilot chat history?
No. Each account keeps its own chat history in the cloud, so switching accounts only hides the other account’s chats until you switch back. Nothing is deleted by switching, although signing out locally may clear cached copies until you sign in again.
Why is the switch account option greyed out in Copilot?
A greyed-out switch option usually means your device is managed by an organisation, or the current session is locked by a policy or a stuck sign-in. Managed work devices often restrict account changes, so check with your IT administrator if the option never becomes available.