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401 unauthorized

The secret is missing, wrong or revoked. Copy the connection URL again from the zapbip number, or ask for a new agent. With the Bearer form, the header is Authorization: Bearer <secret>.

The message is queued

delivery: "queued" means the 24-hour window is closed. The message waits and arrives, in order, as soon as you write to the zapbip number.

Upload errors

The bytes are rejected before anything is stored: See create_upload.