Mail Chimp Integration - invalid API key or List ID

When i am attempting to complete the Mail Chimp integration with Sage CRM, i receive an error message that the API key or list ID is invalid. I am copying the keys directly from my Mail Chimp account, did any one else experience this issue?

Does it have to do with my mail chimp account being free? I emailed mail chimp tech support, i am not sure if this is CRM error or Mail Chimp error. Any help is greatly appreciated thank you.