The fields I want to use for dynamic filters aren't showing as available. How do I change that?

Yes, I sent a screen shot of what I am looking at.

Is there another setting somewhere I am missing?

Multi line text fields are not eligible as a DF.  Can you change it to be a single line text field.  It is also unusual to have a sales rep be a free form data entry field.

I suggest changing this to a either a single line text field or a Multi select field type.  Both are valid as DFs

Thanks!!  That worked.

Which did you go with?  multi select or text?