To do Alt + M K E on Mac in Excel, download and install Accelerator Keys, then press Option, followed by M, K, E.
Command: Trace Error
This is how to do Alt + M K E 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 E traces the source of an error in a selected cell by drawing arrows to the cells that caused the error. This helps you quickly identify which input cells or formulas are causing calculation errors so you can fix them at the source.