Hi:
Does each of your fields have accessibility text? If you don't, you won't hear anything in NVDA or JAWS.
You have a few options, but first you need to open the accessibility text place holder. Then you need to put information in the box or, if you want to use your caption you can. You just have to tell it what you want to use.


You have to do this in LC or AEM, you can't make these types of changes in Acrobat for XFA forms.
Also one last thing, make sure that your overall form is in the correct language. in LC, go to File > Form Properties > Defaults. If you have different ones for different fields, you can change the language at the field level.