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  - Message order, and how to prioritise competing engagements on the same queue.
  
  ## Gotchas
+ - **Deprecated 30 September 2028:** WhatsApp through Azure Communication Services is deprecated (announced 23 September 2026), so the only WhatsApp route this preview supports is on a retirement path. Existing channels keep working until removal. See [deprecation page](https://learn.microsoft.com/en-us/dynamics365/contact-center/implement/deprecations-contact-center#whatsapp-channel-through-azure-communication-services-is-deprecated).
  - A reply arriving after the first response timeout may be handled as a plain inbound message without the proactive context. Five minutes is short for a postal-code-sized campaign.
  - Missing WhatsApp delivery status updates point at Event Grid setup on the ACS channel, not at the engagement.
  - Time zones left off default to UTC, so a "9am local" campaign goes out at the wrong hour for everyone outside the UK.