Hi Becky365!
I am Shakiru, an independent advisor and a user like you, and I am glad to be helping you out today.
No, you do not have to repurchase the Microsoft Office (1-time license) once you have tied the product key to your Microsoft account (the email and password to your Microsoft account become the new activation key).
However, you need to deactivate the Microsoft Office license key by uninstalling the Office apps from the PC that broke before installing it on the new PC and then activate the Microsoft Office using your Microsoft account login credentials (Email and password).
Please let me know how it goes and if you need any other assistance and I will be more than happy to help further.
Thank you
Best Regards,
Shakiru