Hi Bhuwan, InvalidParameterValue: Missing final '@domain' indicates that email format is incorrect. You have added a short answer question to collect email in the form and mapped this field as the "To" option in the Email respondents setup to send confirmation emails. Currently this field does not have the email response validation. So the users can enter any text or number value and submit the form. That's why you are facing issues with email notifications. Open your form in Google Forms > click on the Email field to select it > click on the three dots more icon next to the Required toggle button > click Response validation > select Text, Email > click on the addon icon > click Scorecery > click More options to sync the changes.