Mercedes Lease Extension

Has anyone had any luck extending their Mercedes lease ? Did it a few years back for 12 months without a problem. My current lease is up mid Nov and I just ordered a BMW that might not arrive until mid Dec. Called MBFS and was told they can only do it if I am getting another Mercedes. Wondering if my dealership has the ability to extend it ? Appreciate any help.

Thanks

The dealership doesn’t hold the lease so why would they be able to extend it if MBFS cannot