Incorrect Serial Number

[Silberfalke]

Hi Guys!

After having failed to connect to servers yesterday due to known reasons as
stated in another topic= these issues seem to be solved today as I could see
alot of players again on the servers.
However I still can't access them because of my serial number being invalid
somehow after typing it in.
I legally purchased a copy long time ago but I do not play with steam. I activated
the game via steam at that point and created an account which I believe does
no longer exist, as I do not like steam and must have deleted it after the activation
I believe. However I never had any problems connecting before yesterday, but
now I have to type in a serial number, which I'm being told, is incorrect after
typing it in.
Is this the end, or is there any chance to keep my accounts at NI?

Thanks in advance for any help!

Best Regards,
-Silberfalke