Check below conditions:
- Mail.Send permission → If missing, emails may get saved as Drafts instead of sent
- Connection context → Ensure the Orchestrator connection is authorized for the same mailbox used in Studio
3.Token expiry → Connection tokens can expire silently in unattended runs, causing partial sends
4.Throttling / API limits → 2 seconds may be too low; try increasing to 5–10 seconds
Why it works in Studio uses interactive authentication, while Orchestrator uses a service connection, which may have different permissions.