Invalid Parameter Error - Generate document from Word Template

I am building a power automate flow to take information submitted in a power app and create a pdf that can be sent for signatures. I keep getting Invalid Parameter errors when I get to the "Generate document from Word template" action. I have converted practically all my JSON to strings. After I parse the JSON in the flow, it all looks fine (see screenshot below). I use a compose action before the "Generate document from Word template" action because if I manually build the merge data, my nested data is not available.

I am not finding much of this error so I'm not sure where to look to find where it is failing. Any help would be greatly appreciated.