Xs max can not use 40 watts of wireless charging, the mobile phone does not support the use of such a high power charger, only the original wired charging for normal 18 watts or 20 watts of charging in order to normal operation and use
Not available, xsmax only supports wireless charging up to 10 watts
Even the latest 13max only supports 15 watts of wireless charging
This is supported by the iPhone itself, and it doesn't matter how many watts of charger you use!