KQL Search

//Lists guests who have been invited but not yet redeemed their invites.

//Data connector required for this query - Azure Active Directory - Audit Logs

//Excludes newly invited guests (last 30 days).
let timerange=365d;
let timeframe=30d;
AuditLogs
| where TimeGenerated between (ago(timerange) .. ago(timeframe)) 
| where OperationName == "Invite external user"
| extend GuestUPN = tolower(tostring(TargetResources[0].userPrincipalName))
| project TimeGenerated, GuestUPN
| join kind=leftanti  (
    AuditLogs
    | where TimeGenerated > ago (timerange)
    | where OperationName == "Redeem external user invite"
    | where CorrelationId <> "00000000-0000-0000-0000-000000000000"
    | extend d = tolower(tostring(TargetResources[0].displayName))
    | parse d with * "upn: " GuestUPN "," *
    | project TimeGenerated, GuestUPN)
    on GuestUPN
| distinct GuestUPN