Most likely you do not have the correct bobbin that fits on the bobbin pole.
on the bottom of the pole there may be a small knub in which the small hole on the bobbin should slip onto this holds the bobbin in palce, (if the wrong bobbin is used and if could be just a slight difference in the boobin ) the pole will not spin correctly and not fill the bobbins,
I have seen different bobbins with the same machine with such a slight difference that the owner did not realize it.
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