I am using Fill PDF smart service in the plug-in "PDF Tools" (v1.5.9)

#karthicm Radio button does work using fill PDF tools , you have to use check box in PDF and use PDF scripting so that check box works as Radio button . Hope it helps.

Thanks sanjays416. In the template PDF, the radio buttons are configured as check boxes, with Check Box Style selected as "Check" in the Options tab. The radio button is getting populated correctly using the OTTB smart service "PDF Doc from Template". But, it is not populating using the PDF Tools plug-in. I have a requirement to dynamically decide on which template to use. Hence, I am trying with the plug-in.

There was a defect in the plug-in and hence the radio button groups are not mapping correctly. I have communicated the same to the plug-in author and the defect is fixed now with the release of v1.5.10.