Please Remove the product key so that I can activate it on the correct account.

Product keys for Microsoft 365 and Office cannot be moved between Microsoft accounts once they have been redeemed. After a product key is redeemed at Office.com/setup, the license is permanently linked to that Microsoft account and there is no supported way to “release” or transfer it to a different account.

For future installs and activation, use the Microsoft account that already has the product key associated with it by signing in at the Subscriptions page:

• Subscriptions

If the product key was recently purchased and applied to the wrong account, the only available options in supported guidance are:

• Continue to use the subscription with the account where it is currently redeemed, or
• Request a refund or replacement from the seller if the purchase conditions allow it.

If more help is needed with the Microsoft account itself (for example, access issues), use the Microsoft account help and support options:

• Get help with your Microsoft account

References:

• Using product keys with Microsoft 365
• "This product key has already been used" error in Office
• Get help with your Microsoft account