User never received a voicemail

[mayertech]

I have a user that received a call two days ago and the call report shows the person left a 37 second voicemail. The user has the option "email voicemail and delete from mailbox" enabled. However, there is nothing in their email with this voicemail or any emails from 3cx at all at that time. Is there anyway to figure out why they never received the voicemail or where this voicemail could be? Any logs that would say if the voicemail email was delivered? Any way we can dig up this voicemail? I believe the voicemail was an employee calling in sick, so it's critical we figure out why we didn't receive.