I Can't log into itunes with correct apple ID and password
I Can't log into itunes with correct apple ID and password. I have changed my password at the prompt a few times but to no avail, every time it works for icloud and to log onto my apple ID page online but not in itunes or the app store. Anyone else have this problem or a solution?
Thanks
MacBook Air (13-inch Mid 2013), mac os 10.10.5