Cannot publish flow with Mailchimp trigger

Hi,
I’m trying to publish a flow using the “Member Subscribed to Audience” trigger from Mailchimp, but it doesn’t allow me to publish it. I get a generic error or a message saying there’s no sample data, even though the connection and audience are correctly configured.

I tested with other triggers (like Google Sheets) and it publishes fine.
Can you help me with this?

@JP.C When you trigger that event from Mailchimp, does it load sample data?