If using Office 365 for mail, sometimes Office 365 will automatically Quarantine any email it believes could be phishing.
To find emails/messages that are in this category and may have been filtered out by Office 365, go to the Security & Compliance center and find the Quarantined section here: https://protection.office.com/quarantine . Only admins can remove emails that are in there, however, regular users should be able to review the messages in quarantine.
If possible, reach out to your email administrators with this information so they can help using the information provided above.
If still having issues, try creating an account using an email outside of your corporate infrastructure, such as Gmail or Yahoo, as these services do not block our automated emails.
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