A few days ago I bought a Nintendo eShop Card worth 1600 Nintendo Points. I tried to register it into my Wii as usual and after selecting "REDEEM" there appears error 205568.

My Wii is connected to the Internet properly and it is properly connected with my Club Nintendo account. The points ballance does not exceed 10.000 Points.
I tried using the code several times, making sure that I didn't confuse any numbers and there still appears the same error. There are no problems with Internet connection, either.
Well, my location is set to United Kingdom and I live in Poland (the points were also purchased there). But with Poland set as location, it's impossible to get the Wii Shop Channel working. Is that the reason of the problem?
If so, then meh. Logic.