If you have a "thick" cover on your iPhone 11 Pro Max, please be aware that this may cause problems in achieving a connection between the wireless charger and your iPhone. The solution is to take the cover off, or put a thinner cover on. For example, an original cover.
It is also important that your iPhone is placed correctly on the charging plate. Look in the car's manual to see how it works, or ask the car dealer where the car was bought.
You can find more information about wireless charging on iPhone here:
How to wirelessly charge your iPhone - Apple Support