To do Alt + M K on Mac in Excel, download and install Accelerator Keys, then press Option, followed by M, K.
Command: Error Checking Menu
This is how to do Alt + M K 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 + M K opens the Error Checking dropdown menu in Excel’s Formula Auditing section. This menu provides options to run error checking on your worksheet, trace errors to their source, and check for circular references that might cause calculation problems.