MailChimp integration with CRM

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I'm using CRM v2018R3, and am trying to integrate it with MailChimp. I created and added the MC API Key and List ID to CRM. I created a dynamic group in CRM (a small test list), and clicked "Send to MailChimp." I received this message at the top of my CRM screen: "The Group has been sent to MailChimp. You will receive a notification once the operation has been completed."

I have not received any notification within MC, nor have I received an email from MC or CRM. Any clues? 

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