Hi Fox,
Thank you for sharing your question. I understand about changing the Microsoft account used by the Phone Link app. It's annoying when resetting the app doesn't let you switch accounts. This is because Phone Link saves your account info with your Windows user profile, and sometimes your Microsoft Store account too. If you're logged into Windows with a work account (mainly with Intune stuff), the app will go with that one. I am here to help.
To fix this, you need to totally reset the app and make sure your Windows account works with the Microsoft account you want. Here's what you can do:
Sign out and reset Phone Link: Head to Settings > Apps > Installed apps, find Phone Link, pick Advanced options, and hit Reset. This gets rid of saved sign-in info.
Check your Windows account type: If your PC uses a work account, Phone Link will use that too. To use a different one, you might need to log into Windows with a regular Microsoft account instead of a work one. Go to Settings > Accounts > Your info, and if it says Local Account or is linked to work, click Sign in with a Microsoft account instead.
Re-pair your phone: After resetting, open Phone Link and set it up from scratch. On your phone, sign out of Link to Windows, then sign in with the Microsoft account you want to use.
I hope this answer is helpful, if you have any questions, feel free to reply.
Best Regards,
Noel