All history chats disappeared after upgrading Copilot

Question

All history chats disappeared after upgrading Copilot

James Gooderham 5

"All historical chats disappeared immediately after updating and restarting Copilot. I have confirmed I am signed into the correct Microsoft account and have reproduced the issue across multiple browsers."

Vincent Kemps 0 Reputation points

2026-09-09T05:39:04.83+00:00

Same issue, it only remembered the previous MS365 Copilot conversations.
Vikki-T 9,685 Reputation points Microsoft External Staff Moderator

2026-09-09T08:35:32.8733333+00:00

Hi Vincent Kemps,

Thanks for sharing this. Could you confirm whether the missing chats were from the standalone Copilot experience and whether they are also missing when you sign in to Copilot on the web with the same account?

In the meantime, please try signing out completely, closing Copilot, and then signing back in. Thank you so much for your cooperation.
Vincent Kemps 0 Reputation points

2026-09-09T08:40:52.51+00:00

Hi Vikki-T,

The missing chats were indeed from the standalone Copilot experience. They are also missing on Copilot on the web, no matter which browser I use, and they are also missing on my phone copilot app (Android, Pixel 7). I already tried signing out and back in, but I get the message: "Chats and content couldn't finish syncing. Try again to continue bringing over your chats and content", at the top left of the screen.
Vikki-T 9,685 Reputation points Microsoft External Staff Moderator

2026-09-10T10:01:55.55+00:00

Hi Vincent Kemps,

Thanks for confirming and for sharing the exact error message. Since the same issue occurs on the web, across different browsers, and in the Android app, this appears to be an account-level synchronization issue rather than a device-specific problem.

As you’ve already tried signing out and back in, I recommend contacting Microsoft Support and providing the exact message: “Chats and content couldn’t finish syncing.” Please also mention that the issue started after the Copilot update and affects all devices.

Please avoid clearing or deleting your Copilot activity history while the issue is being investigated. Thank you so much for your cooperation.
Vincent Kemps 0 Reputation points

2026-09-10T10:23:44.2+00:00

Hi, I contacted support thanks to Vikki-T's reply and the fixed my issue immediately!
Vikki-T 9,685 Reputation points Microsoft External Staff Moderator

2026-09-10T10:52:28.7933333+00:00

Hi Vincent Kemps,

Thank you so much for the update, and I'm truly very happy to hear back from you.

If you ever have any other questions or run into anything in the future, please feel free to post your question on the Microsoft Q&A Forum anytime. I’ll always be here and ready to assist you.

Wishing you a great experience ahead!

1 answer

Your answer

Vincent Kemps 0 Reputation points

2026-09-09T05:39:04.83+00:00

Same issue, it only remembered the previous MS365 Copilot conversations.
Vikki-T 9,685 Reputation points Microsoft External Staff Moderator

2026-09-09T08:35:32.8733333+00:00

Hi Vincent Kemps,

Thanks for sharing this. Could you confirm whether the missing chats were from the standalone Copilot experience and whether they are also missing when you sign in to Copilot on the web with the same account?

In the meantime, please try signing out completely, closing Copilot, and then signing back in. Thank you so much for your cooperation.
Vincent Kemps 0 Reputation points

2026-09-09T08:40:52.51+00:00

Hi Vikki-T,

The missing chats were indeed from the standalone Copilot experience. They are also missing on Copilot on the web, no matter which browser I use, and they are also missing on my phone copilot app (Android, Pixel 7). I already tried signing out and back in, but I get the message: "Chats and content couldn't finish syncing. Try again to continue bringing over your chats and content", at the top left of the screen.
Vikki-T 9,685 Reputation points Microsoft External Staff Moderator

2026-09-10T10:01:55.55+00:00

Hi Vincent Kemps,

Thanks for confirming and for sharing the exact error message. Since the same issue occurs on the web, across different browsers, and in the Android app, this appears to be an account-level synchronization issue rather than a device-specific problem.

As you’ve already tried signing out and back in, I recommend contacting Microsoft Support and providing the exact message: “Chats and content couldn’t finish syncing.” Please also mention that the issue started after the Copilot update and affects all devices.

Please avoid clearing or deleting your Copilot activity history while the issue is being investigated. Thank you so much for your cooperation.
Vincent Kemps 0 Reputation points

2026-09-10T10:23:44.2+00:00

Hi, I contacted support thanks to Vikki-T's reply and the fixed my issue immediately!
Vikki-T 9,685 Reputation points Microsoft External Staff Moderator

2026-09-10T10:52:28.7933333+00:00

Hi Vincent Kemps,

Thank you so much for the update, and I'm truly very happy to hear back from you.

If you ever have any other questions or run into anything in the future, please feel free to post your question on the Microsoft Q&A Forum anytime. I’ll always be here and ready to assist you.

Wishing you a great experience ahead!

Answer 1

Hi James Gooderham,

I can understand how concerning this is, especially when the chat history disappeared immediately after the update and the same issue occurs across multiple browsers.

To help narrow this down, could you please confirm:

Are you using the standalone Microsoft Copilot app on Windows, macOS, or a mobile device?
What Copilot app version and operating system version are you currently using?
When you sign in at Copilot on the web and open the sidebar, is the entire history still missing?
If you create a new test conversation now, does it remain available after you close and reopen Copilot?
Are you signed in with a personal Microsoft account or a work/school account?

In the meantime, please try these steps:

Sign out of Copilot completely, close the app and all browser windows, then reopen Copilot and sign in again with the same Microsoft account.
Open Copilot on the web in a private or Incognito window and check the conversation list from the left sidebar.
Check the Microsoft Privacy Dashboard to see whether your Copilot activity history is still associated with the account. Please avoid selecting any option to delete the history.
If the history remains missing everywhere, use the feedback option in Copilot and include the app version, operating system version, and the approximate time the history disappeared.

While my initial response may not fully resolve the issue, I truly appreciate your cooperation as we work together toward identifying the most effective solution. Thank you so much for your understanding.

Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.

Vikki-T 9,685 Reputation points Microsoft External Staff Moderator

2026-09-10T10:00:58.8433333+00:00

Hi James Gooderham,

It has been a while and I am writing to see how things are going with this issue.

Have you had a chance to check the replies provided?

Any update would be appreciated.