Problems implementing bootstrap-multiselect checkbox using Jquery /ASP

I have been working on this all day and have progressively backed off to the most basic sample I could find. It just appears I am not successfully implementing Jquery. Is there some simple step I am missing beyond the code? An import or reference in VS2019? As I read it, I should be able to reference everything I need with a CDN. This is a reference that I used as a sample