Serial key problems

[hopizowsky]

Has anyone an old serial key like from 2016 or earlier he doesn't need for online play?
Obviously the european server doesn't recognise any newer serial keys, i wanted to play it with my brother but he just bought it,
mine from 2016 works.
many thx!!

[HalloweenSax]

Tell him to contact the support, they should be able to fix it. In the TW II forum is a link how to contact them.

I bought the game in 2016 but my key for the TWI doesn't work, only TWII.

[𝓢𝕽𝓟 | ℂ𝔩𝔞𝔴]

I'm having a problem with multiplayer serial key as well
Game says either "Serial Number Invalid" or "Your IP number is invalid due to serial n° authorization error".
Tried reinstalling, manually deleting all files, deactivating steam cloud, even bought the game a second time on GOG but it didn't do it.
I've been looking to play this game online for 13 years and now that I made a friend buy the game we can't connect together... help

[Emeraq]

I know I'm rezzing an old post but didn't want to post duplicate, is this issue that the serial key provided is longer than the fields you can enter them in when the game prompts? Cause that's what I am getting and not sure if we are talking the same issue?

[RPG only]

Your serial key is stored at your game on Steam: right klick on Two Worlds -> manage -> seial key.