Hi @anon3276198 and thanks for the report.
Has this person enabled email notifications in their Profile settings? Email notifications from Asana | Product guide • Asana Product Guide
Have they checked their spam to make sure asana emails haven’t landed in there by mistake?
Unfortunately, this is not something we can directly troubleshoot in the Forum as it requires access to private information that cannot be shared publicly in the forum, so if the above doesn’t help, I would recommend reaching out to our support team following these steps: How to contact our Support Team ✉.