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Cannot save your subscription: Form was filled incorrectly
We have uploaded a list of customers into Magento newsletter subscribers. However these customers can not unsubscribe from the newsletter and when trying to unsubscribe them into the admin, we get the error message: Cannot save your subscription: Form was filled incorrectly
Would you know what needs to be rectified and what is the correct way of uploading a list of subscribers into the admin?
I’m not sure if you are still having this problem, but I came across this today. The problem was that the customer had a white space at the end of their email address. Because of this white space, the email address was failing validation when checking for the newsletter subscription. Not sure if this is your problem, but it might help!