on PowerShell, run
Get-DnsClientServerAddress -AddressFamily ipv4 | Select-Object -ExpandProperty ServerAddresses
(on the result returned you have to detect which dns address is used for your vpn, in my case, 3 result are returned,
2 are internal to my local network than it should be the third (for sake of example: 126.96.36.199).
than i used
wsl --list --verbose
to list wsl2 installation that i had, i had one called
Debian (correspond to debian installed from windows store)