Slightly confusing, and not necessarily directly piracy-related. I run OpenVPN on my Netgear router that allows me to connect to devices on my home network while I am away from home. It works great for most devices, but I cannot connect to any devices that are running Mullvad VPN. Disabling Mullvad on those devices allows me to connect. Also, if I SSH into a device that does not run Mullvad, I can use that SSH session to then communicate with those Mullvad devices. Any ideas?
You need to enable local network sharing on the Mullvad devices.
I definitely have that enabled. Like I said, I can connect to it from a different device on the network, just not from a device "pretending" to be on the network via OpenVPN.
Did you enable "Local network sharing" in the Mullvad app? It's possible that Mullvad is blocking all outside traffic.