Hi Loralie Freeman,
Please note that this is a user-to-user support forum. Moderators, contributors including external Microsoft employees cannot directly intervene in Microsoft product features or access back-end systems. My role is limited to providing technical guidance on reported issues, requests, or ideas.
Because the motherboard has already been replaced and there are multiple Windows profiles and Microsoft accounts involved, I cannot accurately verify the profile-to-account associations from the forum. Making further changes without confirming the current configuration could also put locally stored data at risk.
For more insights and guidance specific to your device, please contact Microsoft Support. Let the support agent know that the motherboard was replaced and that you need help identifying the correct Windows profile and associating it with the Microsoft account used for Microsoft 365 and OneDrive.
I know this isn't the news you were hoping for, but I wanted to make sure you got the most accurate information about your situation.
For your privacy and security, I have covered the personal information included in your post. Please avoid sharing any personal or sensitive information publicly, such as serial numbers, order details, email addresses, phone numbers, or case-related information. Thank you for your understanding.
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.