You have to set a rule to the IPVanish interface to allow access from VPN clients. For testing use Diagnostic Ping. Try a ping to your LAN host with default source and then change the source to IPVanish read reviews and their compatible devices https://whatismyip.network/ipvanish-review/ they support.
If you don’t get a response from VPN ensure that your host doesn’t block access from IPs outside of its subnet.