Connected, No Internet - Multiple Devices

Hello. I am using a Slate AX travel router hooked up to a T10 Franklin hot spot (have tried wireless connection and cabled tethering). For the most part the setup worked and looking in the travel router logs I can see all devices connecting to the router.

Oddly some devices keep reporting “Connected, No Internet” error messages. Received the error on several Android / Chromebook devices however after removing the automatic time zone setting on those devices they now connect fine. The only devices I can simply not connect are Fire tablets, which are actually the most important for my use case.

Any ideas of what I can try here with the Fire devices? The time zone setting

Many thanks

GL GUI → System → Time Zone is, well, for setting the time zone but if the error continues to occur, try this: