The same happened to me to day, got email notification for a reply (first time, before there were replies without notification) but there is no new message in the account. Actually they haven't replied about my KYC process in the last 2-3 days.Sent me a email recently, notification in the account, logged in no notification lol.
Noticed I'd never done KYC either so did it, perhaps i'll be able to read the elusive notification now.