Unfortunately i'm still having trouble getting this to work

The pic below shows the 2 tables (Products & SerialNumbers)

I thought it was best if the serial numbers were put in their own table - so 1 product could have 500 serial numbers, and the tables are linked by the ProductID (Primary keys are set to autonumber in both tables)

I've tried to do a simple query but it wont work, any ideas what i'm doing wrong?

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