Dear @Katherine Kim,
Good day. Thank you for posting your question in the Microsoft Q&A forum!
Based on your description and my understanding, you are requesting a W-9 form from Microsoft and seeking guidance on how to obtain it or have it shared with you.
In this case, the best approach is to submit a support ticket to the Microsoft billing team.
Here’s how you can raise a support request ticket to the billing team:

- In the search bar, type “W-9 Form” > Enter > scroll down, and click on "Get Help" > "Contact support".

- Choose your preferred contact method, fill in the required details, and then click Contact Me to submit your request.

Please notice and accept my apologies that as moderators in the community, I am not supported for the advanced info for Microsoft products. To help you send your feedback and requirement to the related development team, I have redirected you to the correct path.
Again, I truly appreciate your patience and understanding. If you have any further questions or need clarification, please feel free to reach out. I'm looking forward to hearing from you.