I am doing the same for now. I hope they can figure it out! Thanks for making them aware of the issue. I just got the gateway and was confused why it happened til I saw this thread!
I have the Fire HD8 as well, and can confirm I can reproduce this and have the exact same error code 500 when it is connected to the gateway. The instant I disconnect it, the DEVICES would work. The gateway seems confused about the FIre HD8.
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