Almost always because your number is not registered for A2P 10DLC, the carrier system that vets business texting in the United States. Unregistered traffic from a ten-digit business number gets filtered, throttled, or silently dropped, and you rarely get any bounce notice back.
Other common causes: links from public URL shorteners, all-caps or heavy punctuation that trips spam filters, no opt-out language, and blasting the same message to hundreds of numbers from a brand-new number. Register the campaign, use a branded link domain, include STOP language, and warm the number up gradually.
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