I'm using a Flow to create an Email contact after sending a confirmation email from a mailaddress supplied from a Forms-form.
Most of my settings work as intended, but if a person signes up several times I get multiple contacts for the same user, so I wanted to prevent that.
My plan was to get all contacts, filter out any matching the same email that the user has supplied, and if the list is empty (no contact exists) then create the contact.
As seen in the image, I get contacts, but when supplying them to FilterArray it doesn't register anything as input.


Any ideas on what else to try?