M365 Copilot says another account is already signed into my device

Question

M365 Copilot says another account is already signed into my device

Alessandro Garabaghi 0

When we launch copilots new ios app and try to login we get the error

Correlation Id: faaf3122-1d1e-e142-bba1-1031672af52c

Timestamp: 2025-03-25T19:17:51.000Z

DPTI: 49B4C443-F939-431D-B6B6-D4DF58DE2D2B

Error Tag: 5pzx9

Error Code:

another account is already signed into this device.

Venkata Jagadeep 1,400 Reputation points Microsoft External Staff Moderator

2025-03-25T21:29:14.44+00:00

Hello Alessandro Garabaghi,

Thank you for posting query in Microsoft Q&A.

As per the description, we understand that you are getting error that another account is already signed into the device when you launch one of the M365 application and try to login.

Note: This error is expected if you're already signed in by using another Microsoft 365 account from the same tenant.

If this error occurs when only one account is used, follow the steps on Mac devices:

Close all Microsoft 365 apps.

Open Terminal, and then run the following command:

defaults write com.microsoft.Word ResetOneAuthCreds -bool YES

Open the Microsoft Word app and continue with the activation steps.

If the issue persists, try the below steps.

Use the Keychain Access app to delete any password entries that contain "Office."

To do this, follow these steps:

Start the Keychain Access app.

In the Search field, type Office.

Delete any entries that are found.

Note : You should find between two and six entries.

Exit the Keychain Access app, and then try to sign in to the application again.

Please let us know if the issue still persists.

Thank you
Venkata Jagadeep 1,400 Reputation points Microsoft External Staff Moderator

2025-03-26T18:04:48.8833333+00:00

Hello Alessandro Garabaghi,

Did you get a chance to review the comment above?

Please let me know for any further issues and I suggest you refer the below document.

https://learn.microsoft.com/en-us/office/troubleshoot/activation/another-account-already-signed-in
Venkata Jagadeep 1,400 Reputation points Microsoft External Staff Moderator

2025-03-26T20:01:13.3533333+00:00

Hello Alessandro Garabaghi,

Since your request is more related to M365 Copilot issue, I have added the Microsoft Copilot Channel tag to the thread to ensure the relevant team can assist you. Additionally, based on your subscription entitlement, I have created a support case. You can find the case details in your private messages.

Your answer

Venkata Jagadeep 1,400 Reputation points Microsoft External Staff Moderator

2025-03-25T21:29:14.44+00:00

Hello Alessandro Garabaghi,

Thank you for posting query in Microsoft Q&A.

As per the description, we understand that you are getting error that another account is already signed into the device when you launch one of the M365 application and try to login.

Note: This error is expected if you're already signed in by using another Microsoft 365 account from the same tenant.

If this error occurs when only one account is used, follow the steps on Mac devices:

Close all Microsoft 365 apps.

Open Terminal, and then run the following command:

defaults write com.microsoft.Word ResetOneAuthCreds -bool YES

Open the Microsoft Word app and continue with the activation steps.

If the issue persists, try the below steps.

Use the Keychain Access app to delete any password entries that contain "Office."

To do this, follow these steps:

Start the Keychain Access app.

In the Search field, type Office.

Delete any entries that are found.

Note : You should find between two and six entries.

Exit the Keychain Access app, and then try to sign in to the application again.

Please let us know if the issue still persists.

Thank you
Venkata Jagadeep 1,400 Reputation points Microsoft External Staff Moderator

2025-03-26T18:04:48.8833333+00:00

Hello Alessandro Garabaghi,

Did you get a chance to review the comment above?

Please let me know for any further issues and I suggest you refer the below document.

https://learn.microsoft.com/en-us/office/troubleshoot/activation/another-account-already-signed-in
Venkata Jagadeep 1,400 Reputation points Microsoft External Staff Moderator

2025-03-26T20:01:13.3533333+00:00

Hello Alessandro Garabaghi,

Since your request is more related to M365 Copilot issue, I have added the Microsoft Copilot Channel tag to the thread to ensure the relevant team can assist you. Additionally, based on your subscription entitlement, I have created a support case. You can find the case details in your private messages.

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M365 Copilot says another account is already signed into my device

Your answer