SkiBumm,
We apologize for any inconvenience that this has caused, and we’re committed to getting this sorted out. Since two-factor authentication is compatible with OS X El Capitan and iTunes 12.3 and later, it may be causing an issue with Lion. Let’s complete the following steps:
• Put in your Apple ID and password as normal.
• Get the six-digit authentication code from one of your trusted devices associated with the Apple ID.
• On your Mac, enter your credentials again, but this time add the six-digit code at the end of the password. (Don’t put a space or anything else between the password or after the code.)
If you still encounter the same behavior, we suggest following the steps in our previous message.
Stay safe and well!