I have the same problem with hybrid VPN, it puts the PS5 and BO6 in NAT 3 or strict when the VPN is active on the NetdumaR3. On the other hand, if I deactivate the VPN, I go back to open NAT, on PS5 and on BO6. Apparently, the OpenVPN of most of my VPNs do not allow you to play in open NAT. (I tested Norvpn, mullvad, ...) if anyone has a solution to have the VPN in open NAT on netduma, I'm interested?