Cannot download apps after updating 2-step verification in gmail account

Cannot download apps from iTunes after updating gmail account to 2-step verification. I receive a message from the itunes store saying my password is not correct. I have gone into google mail account settings to add an application specific password (ASP) for my itunes account, but it doesn't seem to make a difference. This one-time only password is supposed to update the itunes app to the 2-step verification process, and afterwards you can continue to use your original password. Does anyone have a solution to this issue?