Problems with HDR and Amazon Prime

by I_R_MaNu

I got a problem with my Xiaomi mibox, as soon as i start an Prime Series (Grand tour) my screen gets darker and its greys washed out. This is everywhere, in the menus etc. it only stops when i change the settings. Also my TV isnt showing that it's HDR content (Samsung aprox 2019 LED) it's basically unwatchable this way, can someone help?

I_R_MaNu

I now tried a YouTube Video, and HDR works fine, its displayed on my TV that it's active. So its a Prime error? I really know why i hated Prime all along, in my opinion the worst Stream provider...