Looking for logging into the Gcloud Auth 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 Gcloud Auth site. After that you can login as usual with your login credentials.
https://cloud.google.com/sdk/docs/authorizing?hl=ja
https://cloud.google.com/sdk/gcloud/reference/auth/login
https://qiita.com/yuko/items/1c4ee5b081c5b6a3ac8a
https://qiita.com/kosuke_nishaya/items/3d9a95f559d0c22d8134
https://www.task-notes.com/entry/20151019/1445223600