Q: My magic mouse 2 won't scroll vertically

Hi, tlutzy1.  

Thank you for visiting Apple Support Communities.  

I understand that multi-touch gestures and scrolling aren't working with your new Magic Mouse 2.  In order for gestures and scrolling to work as expected with the Magic Mouse 2, you will need to update your MacBook Pro to El Capitan.

Magic Mouse 2

• Lightning connector, built-in battery
• Requires OS X v10.11 or later

Identify your Apple wireless mouse, keyboard, or trackpad

Upgrade to OS X El Capitan.

Cheers