After installing the latest iTunes for Windows (12.2.0.145) (which as usual failed the first time and had to be repeated) it claimed "This computer is no longer authorized", and prompted me to reauthorize. When I did, it said 5 of 5 computers authorized, which is crazy since I do not use iTunes on 5 computers.
Apple can verify that I'm using WIndows iTunes on only ONE computer, so how do I get the number of used authorizations back to one?
PC
Apple can't verify this, since their records are showing a total of 5 computers authorized for your Apple ID. They don't hold info that identifies those computers - just the difference between the total number authorized on your ID less the number deauthorized. Although erroneous data on Apple's servers can't be ruled out, its also possible that this reflects computers that you've authorized in the past but did not (or were not able to) deauthorize before disposal or change of use.
You can reset the count to zero - in iTunes 12.2:
and then reauthorize the computer(s) you have access to
Note that you can only do this once every 12 months - if required more frequently you can contact Apple Support and ask them to reset the count for you.
Apple can't verify this, since their records are showing a total of 5 computers authorized for your Apple ID. They don't hold info that identifies those computers - just the difference between the total number authorized on your ID less the number deauthorized. Although erroneous data on Apple's servers can't be ruled out, its also possible that this reflects computers that you've authorized in the past but did not (or were not able to) deauthorize before disposal or change of use.
You can reset the count to zero - in iTunes 12.2:
and then reauthorize the computer(s) you have access to
Note that you can only do this once every 12 months - if required more frequently you can contact Apple Support and ask them to reset the count for you.
That is very helpful. Do you know what counts as an "authorized computer"? Does that include iPads and iPhones?
No, iDevice authorizations are handled separately. The "Computers" count is based on the PCs + Macs that you've authorized to access/play/sync Store content in iTunes.
itunes claims 5 of 5 authorizations used
