A message can fail before launch, be skipped by a safety rule, or be rejected by the downstream provider.
Check the channel
Open Settings → Integrations and confirm the required email, Quo/SMS, WhatsApp, PMS, or other messaging connection is healthy.
Check the recipient
Confirm the contact has a valid address or phone number, is eligible for the selected channel, and is not excluded by a suppression list, opt-out, or consent restriction.
Check campaign safeguards
The first campaign SMS must contain STOP opt-out language.
Recent SMS recipients can be skipped by the workspace cooldown.
WhatsApp marketing to US numbers is blocked by Meta.
WhatsApp sends outside the service window require an approved template.
Inspect the record
Open the campaign, journey, signal, or conversation and review its recipient or activity details. Use Operations → System Events for related processing events.
Retry safely
Correct the root cause before retrying. For an SMS campaign sent with errors, use the retry-failed action when available so already successful recipients are not sent the same message again.