If you notice your Automated Message Campaign isn't sending or scheduling your messages, check the settings in the campaign. You might be missing this step!
Step 1: From the Campaigns page, click the pencil icon next to your campaign to go into your AMC edit screen (gold circle in image below).
Step 2: Click the downward arrow (gold circle in image below) to display a dropdown menu of other options.
Check the recipient for each message. Is "none selected" showing (brown circle in image below)? If so, this is mostly likely the issue. Let's fix it.
Step 3: Click the downward arrow to open the dropdown menu. Select who you want your message sent to.
"Subscriber" means the person who texted or was added to the campaign.
"Internal" allows you to choose a user to send an internal message to.
Once you update those messages (you need to check every message) and click Save, people added to the campaign from this point on will receive your AMC messages.
Anyone currently in the campaign will not receive updates made after the time they were added to that campaign. So changes made to a campaign do not necessarily update for everyone.