Hi, these are my remote ping settings. It doesn't seem to work with the standard subscription signup as it doesn't ask for a First or Surname and MailChimp seems to want this as this comes up as the response of the API request in MailChimp "(250) List_MergeFieldRequired - FNAME must be provided - please enter a value".
I have had this problem with the MailChimp plugin you have as well. How can I get this to be integrated with Membership if the subscription form doesn't ask for FNAME and SNAME?
P.S. I have screen prints of my settings if you want them.