failed to use Task scheduler to connect VPN, rasdial.exe

Question

I wrote a batch file with the content as below

c:\Windows\System32\rasdial.exe "VPN Connection" "username" "password" /domain:testdomain 1>>d:\vpn.log 2>>&1

echo. >>d:\vpn.log

I created a Task (using Windows Task Scheduler) and call the batch file, but couldn't connect to the VPN.

In the vpn.log, it prints the error message:

Remote Access error 623 - The system could not find the phone book entry for this connection.

Could anyone advise how do I resolve this issue? I am using Windows 10, build 1809.