Mbox Mini 3rd Gen not appeari as Playback Engine option in Protools 12.3.1 El Capitan

Hello,

Setup:
Mbox Mini 3rd Gen
Macbook Pro (Mid 2012)
10.11 OS X El Capitan
Protools 12.3.1.260
Mbox Mini Driver version 1.3 (most current driver installed)

Protools is not recognizing my Mbox Mini as a Playback Engine or Hardware. The only options I see from the ‘drop-down menu’ are a) ProTool Aggregate I/O, b) Built In Microphone, c) Built in Output. Does any one know how to get Mbox Mini to appear in the Playback Engine list?

Avid Application Manager says everything is up to date and synced. I just got back from the Apple Store and they replaced my hard drive, and I have no computer issues. The Mbox Mini is listed in my System Information/USB. I also tried holding down the 'N' key during startup, to see if I can select 'Avid Mbox Mini' from the list, but it just stopped appearing.

I’ve spent quite a bit of time searching for similar scenarios for the last couple weeks, but no prevail, which is why I’m reaching out for the first time.

Thanks for any assistance you can provide!

-Zach

Mbox Mini 3rd Gen not appeari as Playback Engine option in Protools 12.3.1 El Capitan