Where are you seeing a reason box? They want me to provide evidence:

Please provide any prompts you entered that resulted in your personal information appearing in a response from an AI at Meta model, feature or experience. We also need evidence of the response that shows your personal information.

Have to upload a screenshot of the violation as well.

Edit: cheesed the form and got this:

Thank you for contacting us. We don’t automatically fulfill requests and we review them consistent with your local laws.

Looks like I’m fucked, lol.