Looking for logging into the App Page 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 App Page site. After that you can login as usual with your login credentials.
https://qiita.com/Simmon/items/a763f2309fa8f83a627a
https://secure.store.apple.com/shop/account/setup/start
https://www.mockplus.com/blog/post/sign-up-login-design-practices
https://www.pinterest.jp/timoa/mobile-ui-logins/
https://usabilitygeek.com/perfect-mobile-app-login-screen/
https://apply.commonapp.org/
https://portal.braincloudservers.com/
https://app.hubspot.com/login
https://books.google.co.jp/books?id=WgGDDwAAQBAJ&pg=PT74&lpg=PT74&dq=app+login+page
https://www.ibm.com/blogs/bluemix/2018/06/custom-login-page-app-id-integration/
https://accounts.google.com/ServiceLogin
https://www.netapp.com/jp/site/index.aspx
https://wsvincent.com/django-user-authentication-tutorial-login-and-logout/