I used to get form notifications and they are no longer being sent although it is all enabled.
Can you check the entry details page in the notes to see if there is a green success message or a red error message?
If there is a green message you will need to contact the sending server (usually your hosting provider).
If there is a red error, I would recommend opening a support ticket so that we can troubleshoot the issue further: Log In ‹ Gravity Forms — WordPress