Hi @happycoloringhub ,
That message means your Mailchimp API key either is invalid, or doesn’t have the right permissions to create and delete subscribers. The API key will get the same permissions as the Mailchimp user account that created the key.
Also please make sure you created a normal API key and not a “Mobile SDK Client key”, as that is not the same thing.
You can go to Mailchimp: https://admin.mailchimp.com/account/api/ and create a new API key there.
The correct option is the button directly under “Your API Keys” and not the one at the bottom under “Mobile SDK Client keys”
Hope that helps. If you have any questions, please let me know via the support forum as WordPress doesn’t allow support questions via the reviews system, so this might be removed by the WordPress forum moderators.
Kind regards,
