To do Alt + a v v on Mac in Excel, download and install Accelerator Keys, then press Option, followed by a, v, and v.
Command: Data Validation
This is how to do Alt + a v v on Mac in Excel with Accelerator Keys, the native ribbon and alt key shortcut solution for Mac users who get more done with Excel.
Alt + a v v activates the Data Validation command in Excel, providing quick access to this feature from the ribbon.