On my 2020 Jeep Grand Cherokee i found that if i do this my grinding noise is gone.
Put transmission in neutral, then push 4wd/low button, then push the neutral button for the transfer case. The transfer case indicator will be on and the dash light will show neutral. When i do this the grinding noise is gone and the Jeep is free wheeling with no noises.
I have not talked to Jeep about this procedure as of yet. My only concern would be that it is not in 4 low.
I hope this is the fix for everyone who wants to tow the 2020 and 2021 Grand Cherokee's