The spray arm rotates based on the water pressure coming out of them. If no water pressure, then no rotation. You probably have a clog on the intake hose. You can pull out the dishwasher, tip it forward so you can get to the bottom and then remove the intake hosing to check for debris that might be clogging it. Also check that the arm will spin freely if you spin it by hand, it should.
Let me know what you find. Have a great day.
Benjamin
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