Hi Nolan,
Thank you for reaching out to the Microsoft Advertising Learn Q&A Platform! My name is Jefferson, and I will be assisting you with this query.
We understand your request to update the store name in Microsoft Merchant Center from “FilterBuy” to the newly stylized “FIlterbuy.” While store names cannot be changed directly once a store is created, Microsoft Advertising support can assist with updating the store name upon request. We’re here to help guide you through this process and ensure a smooth transition.
We hope this clarifies the process. If you have any additional questions, please do not hesitate to reach out to our support. I've also sent you a PM so I can assist you further.
Kind regards,
Jefferson| Microsoft Advertising Support Specialist | 1-800-518-5689