FEELING JUTTER FROM STEERING WHEN TURNING LEFT OR RIGHT AT VERY SLOW SPEEDS

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I feel some vibration in my X5 (2019) when turning left and right at very low speeds at the beginning of acceleration. Every time I want to accelerate and turn the steering wheel left or right, I feel a vibration throughout the body of the car. But it's often inaudible if you're not paying close attention or if you accelerate hard. I don't feel this vibration if the steering wheel is straight. My BMW dealer told me the problem might be with the transfer case. They can fix it in two ways: change the oil or replace the transfer case. I'm not sure their diagnosis is accurate because someone else told me the problem might be with the engine mount. I don't feel comfortable starting to disassemble the car if I'm not sure what the problem is. Any help?