CX-9 lift gate warranty

We have a 2019 CX-9 and the lift gate is not working properly. It is still under warranty. We took it to a dealer, but they said there is nothing they can do. Is there a way to contact someone other than a local dealer to get this issue resolved?
17 CX-9 GT FWD
Warranty work must be done by a Mazda dealer. It can be any Mazda dealer, not necessarily the dealer who sold the car to you. What is the issue with the lift gate? Why did the 1st dealer tell you they could not fix it? I would try a different dealer. If that fails try calling Mazda Corp to see if they can assist. Good luck.