I cannot sign in on another computer.

If you are unable to sign in on another computer after purchasing a license for Office 2024, there are a few steps you can take to troubleshoot this issue:

1. Check Email Address: Ensure that you are using the correct email address associated with your Microsoft account. If you are unsure, try recovering your account through the Microsoft account recovery page.
2. Sign Out of Other Devices: If you have signed in on multiple devices, make sure to sign out from those devices. You can do this by going to your Microsoft account settings.
3. Clear Browser Cache: If you are trying to sign in through a web browser, clearing the cache and cookies may help resolve any sign-in issues.
4. Use InPrivate or Incognito Mode: Sometimes, browser extensions or settings can interfere with the sign-in process. Try using InPrivate mode (Microsoft Edge) or Incognito mode (Google Chrome) to sign in.
5. Check License Assignment: Make sure that your license is properly assigned to your account. You can check this in the Microsoft 365 Admin Center if you have admin access.
6. Contact Support: If you continue to experience issues, consider reaching out to Microsoft support for further assistance.

Following these steps should help you resolve the sign-in issue on the new computer.

References:

• Microsoft 365 apps activation error "Another account from your organization is already signed in on this computer"
• Microsoft 365 Apps activation error: "You currently have not been assigned an office license that includes the Office desktop apps"

Dear @三浦雅光,

Thank you for posting your question in the Microsoft Q&A forum.

Before giving you the best solution, could you please confirm these questions below to help me diagnose the issue more effectively: 

1/ Which type of purchase is your “Office 2024” license?

• Microsoft 365 subscription (monthly/annual)
• Office 2024 perpetual (Home & Student / Home & Business / Professional) redeemed with a product key to a personal Microsoft account (MSA)
• Office LTSC 2024 / Volume (assigned by a company or school account)

2/ Did you redeem the Office 2024 product key on a Microsoft account previously? If yes, do you remember which email address you used?

3/ If possible, could you please share the exact error message or error code you see when trying to sign in? and a screenshot of the error screen (make sure any sensitive info like full email address is blurred if possible).

Since you said you are using Office 2024, I assume that you have product key. Therefore, you can install a one-time purchase of Office such as Office Home & Business, Office Home & Student, or Office Professional Office on only 1 PC or Mac. You may transfer Office 2021, 2019, or 2016 to another computer that belongs to you, but not more than one time every 90 days (except due to hardware failure, in which case you may transfer sooner). Any time you transfer the software to a new computer, you must remove the software from the prior computer, and you may not retain any copies. For reference: Transfer your Office license to another device or another person

Office retail licenses are bound to the exact Microsoft account used when the product key was redeemed. However, retail licenses cannot be transferred to another Microsoft account after activation. If you see “email address incorrect,” make sure you’re using the correct Microsoft account associated with your license.

For more information: Troubleshoot installing Office

I hope this information is helpful. If you have any questions or if I misunderstand anything, please feel free to reach out.

Please understand that our initial response does not always resolve the issue immediately. However, with your help and more detailed information, we can work together to find a solution.

Thank you for your patience and your understanding. I'm looking forward for your reply.

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