Disney Plus doesn't work with Wi-Fi amplifier on Fire Tv?

I bought a Wi-Fi amplifier and connected it to my Fire Tv Stick. Everything is going great Netflix, YouTube ect. But when I open Disney Plus there are network problems. If I log in again with the right Wi-Fi, everything will work again?

WLAN amplifier? Or do you mean a repeater? A repeater halves the bandwidth. That's why I have a gigabit repeater. So there are no network problems. A simple repeater does not create the speed you need to stream.

What do you need this amplifier for when everything is going great without it?

Otherwise it always got stuck and it was a bad picture quality