Note: This user was contacted via direct message and their issue was resolved. A summary of that resolution is included below for future reference.
There were a couple of contributing factors that led to the issues experienced by this user, but the most relevant issue was that the user's US-based client needed to set up a 10DLC campaign.
10DLC campaigns are required to send SMS messages in the US region. Readers can visit our knowledgebase for 10DLC, which contains articles that will be able to provide more general and contextual information on 10DLC.
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