Mail Chimp Integration

Mail Chimp
I’m trying something I thought was simple
When there is a new item on a board, copy the details to an audience in Mail Chimp.
There appears to be an integration that does this, however I can’t get it to work. I can connect to the Mail Chimp account OK, but the automation doesn’t appear to start and send the data to Mail Chimp.
Any thoughts?
Thanks
Dave In NZ