Power bank turns off when charging iPhone?

Within a few seconds of plugging my iPhone in, the lights on the power bank turn off, and my iPhone stops charging.
Could this be a defective cord?
Or is it the power bank/ my iPhone?
Please help, it's making charging my phone almost impossible because it won't charge through an outlet. Only my power bank.

If your phone will not charge via a wall outlet, I would guess that your phone is defective.

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