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Is there any visible damage to the headphone jack?
Ok, sometimes the little microswitch inside the headphone jack can get stuck, especially if the wrong connector has been pushed into it.
You can try plugging in and out some headphones several times and check if that helps to release the tiny microswitch.
If it doesn't, then the jack is likely permanently damaged and will need to be replaced by a repair tech.
Hi, just checking in on your question. How did things turn out for you?