Hey @Dean_Kimball,
Thanks for the update! A few things to touch on here:
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Starlink is probably causing some issues, please see this thread for more info: Note for Starlink Customers
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Starlink modems don’t offer port forwarding or IPv6 pin holing, and so the Asus router you have that is most likely set to Bridge mode, is instead acting more like a filter that isn’t passing your IPv6 address properly.
If possible, can you share a screenshot of the RT-AX1800S Asus web GUI (with your IP address blurred?)