SMS "message could not be sent" error

Hi @jnl822 thank you for posting to the Zoom Community!

If you are currently using Zoom Phone SMS as a conversational (person-to-person) messaging tool, you will need to follow the guidelines here to set up a campaign that will allow you to continue sending SMS to your clients. This will allow you to set up your account to work similarly to how it did before 10DLC registration was required.

I also highly encourage you to watch the following recording as it goes over how to successfully submit a campaign and common rejection reasons and how to fix:Recording - Zoom 10DLC SMS Campaign Enforcement Webinar

I hope this helps!