Apple TV blackscreen for Tivimax app

Hi Folks,

I am hoping you can help me. I have paid and downloaded the TiviMax iptv app for my apple tv. But anything in the preview channel is black with no audio and any channel I choose , the screen is black. However, all other streaming apps, Crave, Netflix, etc. etc.. work fine ? I tried to go into Video settings and change them but still the same thing. Does anyone have the fix ?

thx