It seems to be related to the router, either the shared public IP address or NAT.
The "Unable to Verify Game Ownership" issue started happening recently on my PCs. It happens when a second game on the same local network is started. I switched one of the PCs to a mobile hotspot so that it's on a separate network with a different public IP address. It doesn't go through my home router. The issue no longer happens. I switched the PC back to the local network and the issue happens again.
I also tried switching one of the PCs to a separate local network in my house, but the issue still happens. Both wireless networks have the same public IP address since they're connected to the same router.
Update: I enabled a VPN service on my PC so that it has a different public IP address than the other PC. The issue doesn't happen. I'll use this as a work-around.
It looks like MCD-5811 is being used to track the issue where "Unable to verify game ownership" happens when a second Minecraft Dungeons is started on the same local network. I was able to work-around the issue by starting a VPN service on one of the PCs. This gives the PC running the VPN a different public IP address than other PC. I was also able to work-around the issue by moving one PC from the local network to a mobile hotspot.
It seems to be related to the router, either the shared public IP address or NAT.
The "Unable to Verify Game Ownership" issue started happening recently on my PCs. It happens when a second game on the same local network is started. I switched one of the PCs to a mobile hotspot so that it's on a separate network with a different public IP address. It doesn't go through my home router. The issue no longer happens. I switched the PC back to the local network and the issue happens again.
I also tried switching one of the PCs to a separate local network in my house, but the issue still happens. Both wireless networks have the same public IP address since they're connected to the same router.
Update: I enabled a VPN service on my PC so that it has a different public IP address than the other PC. The issue doesn't happen. I'll use this as a work-around.
It looks like
MCD-5811is being used to track the issue where "Unable to verify game ownership" happens when a second Minecraft Dungeons is started on the same local network. I was able to work-around the issue by starting a VPN service on one of the PCs. This gives the PC running the VPN a different public IP address than other PC. I was also able to work-around the issue by moving one PC from the local network to a mobile hotspot.