Error to office online activation want to rol back

Hi all, due a mistake i enter a licence that i entered before in a office online activation,
i do not have the serial number because microsoft do not provide anymore,
how can i do for activate again the product wizard?
Im attaching the warinig window
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David Johnson, CDRetiredCommented:
revoke the license from the management portal (remove the computer). This method will take up to 30 days for the product to check for activation and not get a proper response.

uninstall and reinstall this will take effect immediately but you still have to revoke/remove the computer from the other license using the management portal.

Microsoft does offer Product Activation Codes for the full retail pack which gives you a perpetual license

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ErnestoAuthor Commented:
thank you so much!
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