Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Hello Amber
Unfortunately, you can't change the region to which a product key applies. Product keys are region specific. In other words, you wouldn't be able to use a European Product key in the United States.
If you ended up with a key from the reseller that is not applicable to your region, you will need to contact that reseller or contact Microsoft Support (if you've purchased it from Microsoft) as described in
Office product key error "This product key isn't meant for your region"
https://support.office.com/en-us/article/office...
Note: This is a user-to-user support forum. We're users just like you helping other users. We don't work for Microsoft and can only provide the information applicable to the question/issue posed.