It could be a compatibility issue. I see the app in the Play Store via web view; however, there is nothing listed for system/device requirements to compare. I would suggest you reach out to the developer to see what the minimum specs are, or if there's a pending update to make the app compatible with the Tab 4/8.Can somebody in either tab 4 or tab 8 try ' WIFI 104 ' and see if it's available. This app controls my led lighting system for my aquarium and I went to Best Buy to buy a Tab 4 and the app didn't show available in the store.
Thanks