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Error Bad request

Error Bad request

I have joomla 3.9.13 and jommlamailer 3.0.3. I am not the first time I use this extension. I have it configured.
I create a campaign, I select the list and when I click on the submit button (I remove the test tab). Leave this message.
Error
Bad request
But if I go to the mailchimp panel, I find the campaign but without sending. I find it with the template and everything is correct and I just have to select it and confirm the submission.
Where this error?

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