Google Adwrods - rejected - bad URL

Hello everyone!

One my customers that has a Site on my Multisite network is trying to setup Adwords.
They have a mapped domain http://www.ecoplant-sklep.pl/ - I have mapped both:

http://www.ecoplant-sklep.pl/
and
http://ecoplant-sklep.pl/

Setting the domain with the www. as the Primary one.

I don't know why but Google is rejecting the link and stoping the adwords campaign saying that the URL is invalid. Does this have something to do with the URL redirection?

I have checked:
- The displayed domain and the redirection domain are the same in Google Adwords
- There are NO TYPOS - everything is put in correctly

What can I do to fix this?
Please help!