Well, well, your setup sure loves playing hard to get. If everything’s peachy on your end, then something peculiar is still blocking external traffic after it hits your network but before Minecraft reacts. 
Let’s try a sanity check with AMP directly. In AMP’s “Support” tab under “Diagnostics,” there’s a handy “Copy data to clipboard” button—use that. Once you’ve got the debug info, paste the juicy bits here (as text). It’ll give us a much clearer look at what AMP and your router think is happening.
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