Cannot Import Products/eCommerce Data into MailChimp Using MailChimp Plugin

I am using nopCommerce 4.2 and the free MailChimp plugin from Market Place (https://www.nopcommerce.com/mailchimp-synchronization-plugin-2) and I am unable to pass in products or any ecommerce data and keep getting the following error:

Short message  
MailChimp error. Unable to find the resource at https://us4.api.mailchimp.com/3.0/ecommerce/stores/19087/carts?count=1000&offset=0
Full message  
MailChimp.Net.Core.MailChimpNotFoundException: Unable to find the resource at https://us4.api.mailchimp.com/3.0/ecommerce/stores/19087/carts?count=1000&offset=0
   at MailChimp.Net.Core.Helper.EnsureSuccessMailChimpAsync(HttpResponseMessage response)
   at MailChimp.Net.Logic.ECommerceCartLogic.GetResponseAsync(QueryableBaseRequest request)
   at Nop.Plugin.Misc.MailChimp.Services.MailChimpManager.<>c__DisplayClass68_1.<<GetCartOperations>b__2>d.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at Nop.Plugin.Misc.MailChimp.Services.MailChimpManager.HandleRequest[T](Func`1 request)

Can somebody advise if I set this up wrong.   I have customers flowing through without issue.

Thanks,

Sean Flaherty

Can I get an update please.  MailChimp Support says it's an issue with the API call being made but seeing is this isn't my plugin integration I cannot fix that so could use some guidance here.

Not sure how many here use that plugin, but you may get a faster response from nopCommerce by submitting an issue at either of these links:
https://www.nopcommerce.com/boards/forum/17/bug-reports
https://github.com/nopSolutions/mailchimp-plugin-for-nopcommerce/issues

At a glance, it sounds like the API request is successful but Mailchimp cannot find anything to associate it with for the response.  Did you connect your store?
https://mailchimp.com/help/connect-your-online-store-to-mailchimp/

I'm assuming if so then your mailchimp store id is 19087?

I would download the source code from the github link above and step through it so I could see exactly how the request was being sent.  Also worth looking into so you can see what Mailchimp sees on their end:
https://mailchimp.com/developer/guides/about-the-api-playground/