Viewing optik tv on tablet

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LadyMartini
Resident

I have a Samsung SM T290 upgrade from Galaxy Tab A, SM T350.  I have no trouble watching optik TV on the old tablet but cannot get it to work on the new tablet.   I have installed and Uninstaller the ap a number of times. When I try to open the app the 3 dots just keep pulsing but nothing happens. What am I doing wrong?