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E28012 — AMBConversationNotFound

No conversation matches the identifier given.
  • HTTP status: 404
  • Type: not_found_error
  • Name: AMBConversationNotFound

What to do

On a send, this means the (from, to) pair names no conversation. Apple issues a customer identifier per brand, so check that from is the business this customer opened a conversation with, and that to is the opaque_user_id from that conversation rather than one from another brand. Your business cannot open a conversation, so a customer who has never messaged you has no identifier to send to. Elsewhere it means no conversation matches the id given.