Each form can be configured to send a confirmation email to the person who submitted the form and a notification email to one or more people responsible for handling the form entries. If someone is not receiving a form email notification there are a number of things that could be the culprit. This article gives a comprehensive rundown of things to check: https://docs.gravityforms.com/troubleshooting-notifications/#use-a-valid-from-address

For instructions on proper notification setup, please watch this video from Gravity Forms: How to Enable Notifications- Gravity Forms Tutorial