Wifi access point no longer found on my macbook pro
You can try to manually connect using the terminal (copy and paste following (one by one).

You can skip step one and two, and go to step 3, and enter your SSID and password.

Turn On

networksetup -setairportpower en0 on


Find

/System/Library/PrivateFrameworks/Apple80211.framework/Versions/A/Resources/airport scan


Connect

networksetup -setairportnetwork en0 WIFI_SSID_I_WANT_TO_JOIN WIFI_PASSWORD


In your case it sounds like your Router is denying you the access. The settings depend on the router type.

Here is a example of mine. (not blocking anyone)



You know this but just making sure: