There are a few reasons that you may not have received the email nominating you as a reference writer. Please do the following if this occurs:
Confirm your email address with the applicant. Check to ensure that the email address the applicant entered for you is accurate. If there is a typo or if they need to change the email address, the applicant can edit the reference writer record in their application and have the nomination email resent to you. An exact email address is crucial to matching the reference writer and the applicant in the GRFP Module.
Check SPAM folders. Check your SPAM or trash folder to ensure that the email did not get sent to one of those folders inadvertently.
Use an alternate email address. It is possible that your email domain is rejecting the email and not allowing delivery. In this case, provide an alternate email address to the applicant and they will be able to edit your reference writer record in their application and re-send the nomination email.