This connection should be functioning. We have verified on the Mailchimp side that everything is connected. I can see the connection in the API tools. I am just not seeing any information communicating from Gravity forms themselves. Are there intermittent issues? Mailchimp is not receiving any API calls from your product.
Please open a support ticket at: https://www.gravityforms.com/open-support-ticket/technical/
Before opening the ticket, please test with logging enabled: Logging and Debugging - Gravity Forms Documentation
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