Deauthorizing old computers for my iTunes

When I go to the online information for deauthorizing old computers for my iTunes (because iTunes will not play some of he music I have on iTunes because it says "there are already 5 computers authorized" - this is the process I receive (see below).

1. Open the Apple Music app or Apple TV app.
2. Choose Account > Account Settings.
3. Sign in with your Apple ID and password. Forgot your Apple ID?
4. At the top of your Account Information page, go to the Apple ID Summary section.
5. Next to Computer Authorizations, click Deauthorize All.
6. Authorize each computer that you use again.

BUT, when I do this in my iTunes, in the Apple ID Summary Section - there is not a link that says "Computer Authorizations." I have reviewed several documents I have found during my search as to what to do and they ALL say there is a "Computer Authorizations, click Deauthorize All" - AND, that does not exist on my iTunes Account settings. The only thing I can see is to deauthorize "this" computer.

What else can I do to deauthorize the computers I no longer have, because the above 6 steps to not work for me. They do until step 5 and 6 where there is not a place to deauthorize them all.

HELP. Danny