Hi,
If you have the latest version of Phone Link, the executable is located here:
C:\Program Files\WindowsApps\Microsoft.YourPhone_1.25031.60.0_x64__8wekyb3d8bbwe\PhoneExperienceHost.exe
To find the version and the installation location of Phone Link on your system, please run this in PowerShell:
get-appxpackage *yourphone* | select name, version, installlocation
Note that UWP apps can update, which might change their executable paths, requiring you to update the exclusion list accordingly.
If you can't exclude Phone Link or other Store apps using the above method, please contact F-Secure Support to know if there is any other method to allow an UWP app to the whitelist.