Hello, thank you for reaching out to Microsoft Q&A.
Do you have an option to switch accounts on the Phone Link screen?
OR
- Search for Phone Link in the search bar on the taskbar, right-click the results, select 'App Settings'.
- Scroll down until you see 'Reset'.
- Once the reset is done, launch Phone Link again and sign in with your existing Microsoft account.
If you are still having issues,
Please share a screenshot of the screen where you see this account.
This will help us understand the problem better.