Radio button config error

I’m building a form for a client. Running Contact Form 7 Version 5.6.3.

<label> Are you a current patient?
[radio currentpatient id:currentpatient label_first default:1 “yes” “no”]</label>

throws a “configuration error detected”, but appears to function properly. What is the config error here?

Adding a * to make it required:

<label> Are you a current patient?
[radio* currentpatient id:currentpatient label_first default:1 “yes” “no”]</label>

does not show the config error, but on the form it displays as text, not buttons.