Hi latfio,
In the marketing form submission entity, there is one field named matched contact, which store the guid of the contact.
So you can use it in the power automate:
However, if you use a "marketing form submission added" as a trigger, don't follow it up by directly using the get contact, why?
When a Form Submission is received, it doesn’t link it to a Contact and/or Lead at the same time that it is created.
Processes then run to look for existing records(s) first, and then try to link, or create new records. So, we can’t just run our flow and send out an email all in one go, believe me, I tried.
We need to wait until the records are found and matched or created and matched.
Refer to the following link to check to make sure a Contact or Lead has been linked to the Form submission:
https://meganvwalker.com/create-email-notification-d365-form-submittions/
