For making it clear, when you are doing auto fulfill your order, there's some information of your order was missed and not completed, such as: city, country,... so it will stop you and your order won't be able to be completed.
Please check the incorrect information again, then revise the correct one and Save to go on confirming payment and finishing fulfillment.
I hope this might be helpful for out.
Reference: Video - How To Fulfill Order Automatically
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