Hi,
Thank you for writing to Microsoft Community Forums.
I understand that you receive an error, ‘Check the Zip or Postal code in your address.’ when trying to purchase Microsoft Office. I’ll certainly assist you with the issue.
I would suggest you to refer the section Does your account region and Microsoft Store location match? from the article Troubleshoot problems when paying for something from Microsoft Store and see if that helps.
However, for any concerns or queries related to purchase, we do have a dedicated team, let me help you with the details. You can contact the Microsoft Store Support team and they will help you with the appropriate details.
Regards,
Nikhar Khare
Microsoft Community - Moderator