I have 2 scheduled reports that are supposed to be emailed to a distribution group with 4 members. Only 2 of the members are receiving the email. I ran a Message Trace in Exchange Online and it shows that Adaxes did not even try to send to the 2 people that didn't receive it.
I changed the Recipients on the Scheduled Report to the 2 members that didn't receive the emails (individually, not in a group) and ran the report and nobody received it.
Message Trace in Exchange Online shows that no messages were sent at all.
I tried again with another unrelated user account and it sent just fine. There's just something about these other accounts that Adaxes doesn't like and won't send email to. Where should I start looking for the problem?
Never mind. I figured it out.