Mailchimp API error

  • Resolved manonvanh

    (@manonvanh)


    2 years, 6 months ago

    We’ve been using the MC4WP plugin for a few years without any problems. Now all of a sudden we get a Mailchimp API error when someone tries to subscribe.

    The debug log error message:
    Mailchimp API error: 400 Bad request. Invalid Resource. The option “message” does not exist in constraint “MC\API30\RequestModels\Constraints\ValidIPConstraint”.

    Plugin, theme and wordpress are all up to date. We didn’t make any changes to the form or in Mailchimp.

    Any ideas how to fix this or where to start looking? Thanks!

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