Dynamic Reply-To In Sprout Forms Notification
It looks like you might need to update your dynamic values. Sprout Forms supports two types of syntax for dynamic information.

1) Shorthand syntax:

{formFieldHandle}


2) Object syntax:

{{ object.formFieldHandle }}


Submitted values from your form entry should be available in all of your notification fields:


Email Recipients
Subject
Sender Name
Sender Email Address (although you probably don't want to set this dynamically as it can affect deliverability)
Reply To Email Address