fadedglory wroteI changed the windows service to autostart
Then you will have to remove the passphrase .. the simplest way to do this is by creating and using a new server cert/key like so:
easyrsa build-server-full servername nopass
EASY-RSA for Windows:
https://github.com/OpenVPN/easy-rsa/releases/tag/v3.0.0-rc2
Note:
https://forums.openvpn.net/topic19629.html