Hello @MarketerL74804 ,
If this is regarding a Welcome Email automation, are you explicitly using a sign up form created through us - either a landing page or coded form, or an integration form? Or are you using a form built outside of our system to collect and sync the contact info?
For an automation that will trigger off of new list additions from any source, I'd recommend creating an advanced automation series (Plus feature). Otherwise, only sign up form additions to the specified list of a welcome email (or all lists if selected instead) will trigger it to send.
I did check the new subscriber welcome you have setup, and your most recent sign up addition was included in that, so I'd recommend checking how you're adding the contacts, as well as if the contact(s) that should have received the welcome weren't already in that list.
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