Alerts & Actions rule - Invalid Recipients

edited 12/09/19 in Smartsheet Basics

I've set up a proper chain of approvals that go off without a hitch when I use myself or my managers email.  However, when it comes to adding the real people I want to sent the request for approval out to I get a Invalid Recipient in my Alerts and Actions Rule.  I've doubled checked and the email addresses are correct and they are within my organization.  What I'm I missing?