How to have multiple Y axis in Excel

It turns out that the maximum number of "multiple" Y axis in an Excel scatter graph is two. The other one is called the "Secondary" axis. The good news is that once you find the controls to turn it on it's as easy to format as the first one. Here is an article on how to find those controls:

https://www.extendoffice.com/documents/excel/2019-excel-make-two-y-axis.html