Can't read signal from airport

I can connect my macbook directly to the ethernet and the internet works. My airport reads the internet when I plug the ethernet into it also (green light). But my computer won't connect to the internet via the airport. What gives?

ok correction - the AX is NOT successfully connecting to the ISP. There is a green light on the AX, but when I run a network diagnostic through Safari, it says I have an airport detection, but there is a yellow light for network settings, and red lights for everything else (including ISP failed). I tried to configure the AX using airport utilities, but it says that IP is already in use? Not only that, now the airport utility will not detect my AX so I can reconfigure it. Aaaaaaahhhhhh
Again, the situation: the ISP must work because I can get the internet directly from the ethernet to my mac. But the airport is not able to send the signal to my mac.

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even flow wrote:
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