Plutonium

I have searched through all the forum posts regarding the "Challenge Verification Failed" issues people have been having and no one has given a solution. The one with the Staff member saying to logout of the launcher then re-log in does not work for me. If anyone knows how to fix this please let me know, I can't join ANY public server on black ops 2.

Nope, i've been having the same issue and this method does not work for me, if anyone knows how to fix it please help