Power BI Embedded Custom Color Themes in Reports do not promote

I downloaded the JSON you provided, applied it to my desktop version, re-published to the web.  All was fine (as it was initially).  The problem behavior for me still remains the same in the final portal that I am using to "embed" the pages with the "publish to web" option.  If I change the visuals (new graph, etc) in my base file and do the various steps to "publish" them, those changed visuals do promote through to our customers portal (which is an "azurewebsites.net" solution).  The issue is that the viusals lose the custom colors that the JSON file probvides, and the embedded report pages revert back to the default colors of Power BI.  Is there something that the web guys I am working with need to do as well to make these custom colors follow all the way through to the embedded visuals?