Using a variable to input send to email into Sendgrid dynamic send

I am trying to use the sendgrid dynamic send function to send an email confirmation to a specific end user when they update a record.

I have set a get record function to return the only email of the user from the user database.

I then set the to email in the sendgrid function to use the outcome of the get record.

When I do a run and debug I get an error saying that the to email address in the sendgrid function is an incorrect format.

Does anybody know where I am going wrong?