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Addressing: to and recipient

Every send accepts to (a phone number), recipient (a business-scoped user ID, including the parent ENT variant), or both. When both are present, Meta delivers to the phone number, so sending both is the recommended default once you have both identifiers.
One limit from Meta: one-tap, zero-tap and copy-code authentication templates require a phone number and cannot be delivered to a BSUID. See Business-scoped user IDs for the full migration.

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