I’ve got the same issue. Just bought a PMDG 737 that I can not use because the add-on support can not be installed on my console - I tried to install it a lot of times already, restarting the console etc. but when I press ‘install’ it jumps straight to 100% and then when I start the game it asks me to install the add-on support again and shows it as ‘not installed’ in the store…