Block display Input (Touch) Android not working

Hey, I am using the Method where you create a Image set the Alpha to 0 and check raycast. I use this Method to block all Userinput during the tutorial Animation. It works on my PC, but when i compile the Game for Android and try it on my phone, it does not work and i can scroll up and down and click everything. (Yes the Image is on the Bottom in the Hirachy so it should block all screen and it is above the whole screen, so its not to small or anything.) Is there an other method to block userinput for tutorial scenes ? Does anyone encountered this before and can tell me what is most probably the problem? Sorry for the bad english. A helping hand would be very appreciated. Thank you. with best regards