Keyboard dont work on IOS

hello, I saw that we can use mouse and keyboard on minecraft Bedrock édition, totay i bought a bluetooth keyboard, no problem for connect him to my iphone SE, it works, but when i try to configurate the control of keybord on the option, it didn’t work. Exemple, if i click on the button to change the key, it make >w< and if i clic on the letter « u », the key dont change in u, it stay in w. So it is impossible to change key. And even if i try to play without changing the key, it is impossible, clicking on the keyboard dont work at all thanks for reading my bug report and sorry for the mistake i am from France

IOS 12.1.2, on iphone SE