Hi,
You will want to ensure that you correctly extract all recipient email addresses from the incoming email with the help of modules like match and text aggregator…it would allow you to form a comma-separated string that would then be used as the value for your “To” field
Here are some useful links and guides you can use to learn more on how to use the Make platform, apps, and app modules. I found these useful when I was learning Make, and hope they might benefit you too —