Like all good companies, we have dynamic distribution groups / lists that are based on the location of the user. Example, a user has the Office location of “Australia”, the dynamic list has the filter of:

((((((Office -eq 'Australia') -and (RecipientType -eq 'UserMailbox'))) -or (((CustomAttribute2 -like 'IncludeAllAUSLists') -and (-not(CustomAttribute1 -like 'excludefromdynamic')))))) -and (-not(Name -like 'SystemMailbox{*')) -and (-not(Name -like 'CAS_{*')) -and (-not(RecipientTypeDetailsValue -eq 'MailboxPlan')) -and (-not(RecipientTypeDetailsValue -eq 'DiscoveryMailbox')) -and (-not(RecipientTypeDetailsValue -eq 'PublicFolderMailbox')) -and (-not(RecipientTypeDetailsValue -eq 'ArbitrationMailbox')) -and (-not(RecipientTypeDetailsValue -eq 'AuditLogMailbox')) -and (-not(RecipientTypeDetailsValue -eq 'AuxAuditLogMailbox')) -and (-not(RecipientTypeDetailsValue -eq 'SupervisoryReviewPolicyMailbox')))

The user was added and then the office location was of Australia was added (after troubleshooting below). He complained he did not receive an email that was sent to this distribution list, so I had to verify he was a member.

Connect to your Office 365 online powershell (I have it previously documented if you don’t remember).

$GROUP = Get-DynamicDistributionGroup "All-Australia-Employees"
Get-Recipient -RecipientPreviewFilter $FTE.RecipientFilter -OrganizationalUnit $FTE.RecipientContainer