getFieldValue() in On Success

getFieldValue() in On Success

Excuse me,

I follow the below example :
Can the SendMail from a form only send data from the decision checkboxes selected by the user?

value = formMap.get(key);

As result, the value returned "null"  in my email.

I have tried the same way to return the output on a plaintext field, it succesfully showed the value.


Is this any problem on it that I cannot use getFieldValue while On Success ?



Best Regard