Acrobat does not execute javascript in document sent for signature

I started noticing that pdfs with embedded javascript that used to work no longer do. The javascript executes properly in the Acrobat Pro DC app, but when I send the doc for signature, the javascript does not execute.

To test it, I created a test doc with just a couple of fields. I inserted the following javascript: app.alert(‘howdy’);
as the validation code in one of the fields.

It works fine in the app but when I send it out for signature, it does not execute. I’ve spent hours chatting with Adobe agents. They repaired my installation, uninstalled it, reinstalled it, cleaned it, tried everything. Ultimately they declared that it was a javascript problem and not their responsibility.

I need help, and it doesn’t appear to be forthcoming from Adobe.