I am also getting the exact same issue on Debian 12 and have also verified that T6MP works perfectly on the same machine.

I used the same server key on a Windows and it works fine, so this indicates that it is possibly a Linux/Wine issue. However, considering T6 works fine on the exact same machine with Debian 12 makes me even more confused.

I have done extensive troubleshooting and can't see any way forward without support from the Devs.

That makes sense, thanks

That's what I thought, I am just more interested in the validation process i.e. How does Plutonium validate against the Steam version to generate a server key? What stops Plutonium validating against a CD-key version?

Resxt Thanks for confirming.

I understand that the Steam version ran out of CD keys and anyone who tries to make an account after WaW ran out of them, cannot play any form of multiplayer.

So I guess the CD key version still talks back to the Activision Master server still, whereas Plutonium uses its own back-end?

If there is any more doco online on how this works, that would be great I am just more curious as to how the mechanism works.

I own the CD version only too, can anyone confirm if this is possible?