We are talking about TVOS. 17.
I got a response back from Tablo they are aware and working on it but 0% of substance. For comparison, I have been getting this same response from issues with TVOS 16 months ago and still not resolved.
I agree that the tvOS app was a problem, but the iOS app failed almost identically for me. I have only been able to test the 17.2 PB2 on iOS so far. Until this 17.2 beta stream I had no serious problems with the Tablo app on AppleTV. To be clear, I am testing with the Tablo Legacy platform, not the new product.
tablo quad ios 17.1 not working on tv app.
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iOS 17.2 and tvOS 17.2 Public beta 3 seems to have resolved these issues. Let’s hope the fixes stick for the final release.
At least you have an app 
the new white Tablo can not even work at all on AppleTV devices. I had to hook up a FireTv Cube just for it. Really should have not even been released without this support I think, just rushing to sell the 2 tuners off so they can start selling the 4 tuners. It’s not a accident they are pushing the 2 tuner so hard and not releasing the 4 tuner yet. Right after the holiday sales pushing the 2 tuners,watch the 4 tuners will magically start shipping.