Re-posting here for an issue originally reported at: https://forums.adobe.com/thread/2185369
I am using Adobe Acrobat DC via a CC subscription to create a simple form that is to be digitally signed by another party. I generated the PDF using Microsoft Word, opened the PDF in Acrobat, and went directly to Tools -> Prepare Form. I added 4 "sender" fields whose roles are "prefill", and then one group of three radio buttons whose roles are "signer". I used the radio button tool from the toolbar to add each button individually (no copy/paste). I completed the rest of the form which consists of one checkbox, a signature field, a date field, and two more text fields. Unfortunately, when testing the form through Send for Signature, the radio buttons were not available to be edited by the signer.
I re-opened the PDF in Acrobat and again selected Prepare Form. When examining the properties for each of the 3 radio buttons, the role was now showing as Prefill and the dropdown for selecting a different (correct) role was disabled. The workaround for this was manually renaming the button group to include the desired role. Once this was done the form is now working as expected.
Hopefully the below info helps to illustrate what was seen. Note that in my case I don't care to see the "Choice" label, for example 50x10M, so only the radio portion is visible. Since there is a workaround, I've moved on to other things, but the fields in the Properties dialog are still disabled so something still doesn't seem quite right.
And lastly, this is the Properties -> General tab for the Group.
AdChoices