Looking for logging into the Unifi Failed site and are not getting the correct working link for it? In such a case, you can use the links given here by searching your desired login page in the search box. If the page is present on our website then you will get all the links related to the Unifi Failed site. After that you can login as usual with your login credentials.
https://community.ubnt.com/t5/UniFi-Wireless/Unifi-controller-Login-error-Invalid-username-and-or-password/td-p/2174012
https://community.ubnt.com/t5/UniFi-Wireless/UNIFI-CONTROLLER-5-8-28-login-bug-and-login-failure-as-of-August/td-p/2461286
https://community.ubnt.com/t5/UniFi-Wireless/Cannot-login-to-UniFi-controller-Invalid-username-and-or/td-p/2098405
https://community.ubnt.com/t5/UniFi-Wireless/can-t-log-in-to-unifi/td-p/1515424
https://community.ubnt.com/t5/UniFi-Wireless/UniFi-Adoption-Failed/td-p/311147
https://community.ubnt.com/t5/UniFi-Wireless/UniFi-Easy-Setup-quot-login-Failed-quot/td-p/1547295
https://community.ubnt.com/t5/UniFi-Wireless/Unifi-Login-Failed-after-update/td-p/1424173
https://community.ubnt.com/t5/UniFi-Wireless/Login-error-There-was-an-error-making-that-request-Please-try/td-p/1707571
https://community.ubnt.com/t5/UniFi-Wireless/User-login-error-after-controller-migration/td-p/2199321
https://community.ubnt.com/t5/UniFi-Video/Web-interface-login-failure-iOS-app-not-affected/td-p/2016932
https://community.ubnt.com/t5/UniFi-Wireless/AUTHENTICATION-ERROR-on-UNIFI-AC-LITE/td-p/2128181
https://community.ubnt.com/t5/UniFi-Wireless/API-login-failed-using-UniFi-4-1-1-release/td-p/1052041
https://community.ubnt.com/t5/UniFi-Video/iOS-app-quot-Sign-In-Failed-quot/td-p/1223022