If your client is not receiving email notifications, there are a couple troubleshooting steps you should take:
Does your client have an email address?
Please check that your client has a valid email address in their client profile. If their account is unclaimed, you can send them the welcome email to verify emails are being sent.
Has an email been sent?
On the client's profile, you can click sent emails to see all the notification emails sent from Pike13 to this client. If you see the email there, the client may have a filter set up, or it may be going to their spam folder. Occasionally, we see email providers reject our emails and they bounce back. If you are seeing that, ask your client to add the sender to their address book.
Does your client have email turned on for this notification?
Clients can manage their notifications by clicking on Notifications to the right of their dashboard. From there, they can click settings up above and manage their notification settings. Ask your client to check if notifications are enabled for the email in question.