Commas stop working in formulas in Excel.
As soon as you type a comma and move on to the next argument, the formula gives you an error.
Clever: Build the formula with the Function Arguments dialog, and
you will see =VLOOKUP(A2|Table|2|False)
The | is a pipe. It is above the backslash on the US keyboard
Go to Control Panel, Region & Language Settings, Additional Settings, List Separator
Change the List Separator back to a comma
If you changed the list separator because some system is giving you PSV instead of CSV, watch:
Windows 7, Control Panel, Regional Settings, Additional Settings, List Separator
Windows 10, Control Panel, Clock, Language and Region, Region: Change date, time or number formats, Additional Settings, Numbers...