Unable to setup Media & Purchases linked to my Apple ID with "authentication failed" error.

Solve the disabled problem and the other may be solved too. The support article If your Apple ID is locked, not active, or disabled - Apple Support has solutions for three frequently encountered reasons for an account to be disabled/locked/not-active:

● If a message says "your account has been disabled in the App Store and iTunes Store" or "You cannot login because your account has been locked", you might be able to request reactivation by tapping Continue right from the alert. If that does not work, Apple provides a link for this specific issue. Tap or click here and choose a self-help or contact method ➞ https://getsupport.apple.com/?caller=kbase&PGF=PGF63005&category_id=SC0245&symptom_id=23362 .

● If your account has been disabled for “security reasons” the solution is to reset your password as outlined in this document: If you forgot your Apple ID password - Apple Support

If you find you can’t sign in, reset your password, or receive verification codes, you can request account recovery (read this support article: How to use account recovery when you can’t reset your Apple ID password - Apple Support ) to regain access to your account. More detail in —> Activation Lockout Issues - Apple Community For additional assistance from Apple Security, read: Contact Apple for support and service - Apple Support

● If your account says “Account Locked”, or it is inactive, that is not the same as it being disabled. You might be able to request access to your account by tapping Request Access right from the alert. If that does not work, this link (versus one taking you to the general support page) is the most direct way to get to the people helping you with this —> https://getsupport.apple.com/?PGF=PGF63005&category_id=SC0245&symptom_id=23626

or by telephone at one of the numbers in this support article --> Contact Apple for support and service - Apple Support