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If you glue it, you or Tesla service will not be able to remove that piece without completely taking down your entire headliner. You need to be able to remove that if you ever have a light bulb go out, or issue with your hazards light button.
It is intended to fit perfectly, and stay that way for the life of the vehicle using clips. Take it to Tesla and have them fix the bad clips you were given.
I would not use glue. You may need to get in there at some point in the future. If you are not willing to replace the failed clips, then try very thin double sticky tape and see if that works. I did that to one edge of my back panel last year and it still holds well.
Why are you accepting defects in a $60k car like it was out of warranty? It's brand new vehicle that is losing hue amounts of value and it's not perfect? Force Tesla to make it perfect. You deserve no less.
I agree — why take the risk (and responsibility) of trying to “fix” it with glue when it should be a warranty item.
Plus, Tesla won’t know it is an issue (or if it’s larger issue) if you don’t tell them about it. It could be a fluke — just a bad part — or a larger design issue that can be addressed (like the rear seatbacks).