Apple iTunes Authorization

I have iTunes running on a Windows 10 computer.  I always suspect that Apple likes to punish PC users, though I can't prove it.  I regularly sync my iPhone 6 using iTunes.  All of a sudden I started getting a message that my computer is not authorized (same phone and computer I've been using for several months) - see attachment.   When I try to authorize the computer it asks for my password, which has been the same for years.  I get a message that my "Apple ID or Password is incorrect".  I try making a new password, but it asks for a secondary verification that I don't  have.  I had a "Recovery Key", but it won't accept that either.  Now I'm stuck and don't know how to get back on track.  Please help.

Thanks,

Phil
Apple-Authorization-Error.PNG