If you request an email and it is not received as quickly as expected, the delay can be caused by a bottleneck in a number of places, including where servers are swamped with large volumes of mails. We encourage the applicant to be patient, since immediately submitting a new request will simply make the blockage worse.
If after 4 hours you still have not received an email, please try the process again, making sure that you enter the correct details.