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This could keep the bobbin winder from spinning. Maybe you have gotten some thread wrapped around the pin that holds the bobbin. It can be hard to see under there, so a small flashlight helps.

Make sure that the bobbin winder is engaged.

Check if there are scratches or other defects on the bobbin.

Check if the thread is passed through the bobbin winding guide correctly.

Check if you aligned the groove in the bobbin with the spring on the bobbin winder shaft and pressed down on the bobbin until it snapped into place.

Verify that you are using the correct size bobbins.