Direct answer
What commonly causes microwave turntable not turning?
For a microwave with this symptom, the most relevant component families are Turntable motor, Turntable coupler, Turntable roller guide, Control board / relay.
Most relevant
Component families associated with this symptom
These are component types commonly connected with this malfunction. They are not model-specific part-number recommendations.
High relevance1
Turntable motor
The turntable motor directly rotates the tray drive.
High relevance2
Turntable coupler
A stripped coupler can disconnect the tray from the motor.
Additional possibility3
Turntable roller guide
A damaged roller ring can bind tray rotation.
Additional possibility4
Control board / relay
The control supplies power to the turntable motor.
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Functions being matched: Turntable motor, Turntable coupler, Turntable roller guide, Control board / relay