Looking for logging into the Sharepoint Server 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 Sharepoint Server site. After that you can login as usual with your login credentials.
https://www.credera.com/blog/technology-insights/microsoft-solutions/how-to-sign-in-as-a-different-user-in-sharepoint-2013/
https://www.office.com/?omkt=de-de
https://products.office.com/de-de/sharepoint/sharepoint-online-collaboration-software
https://support.office.com/de-de/article/anmelden-bei-sharepoint-workspace-c91a4af7-29df-48a2-877e-d470deb4ce50
http://www.ncompasslabs.com/
https://stackoverflow.com/questions/21139527/sign-in-as-different-user-in-sharepoint-2013
https://blog.vinewave.com/how-to-sign-in-as-different-user-in-sharepoint-2013-2016-on-premise-956f1790d721
https://social.technet.microsoft.com/Forums/office/en-US/db8cedb3-9db7-4844-9b91-1675e60c9b85/sharepoint-prompts-user-to-login?forum=sharepointadmin
https://docs.microsoft.com/de-de/sharepoint/administration/configure-the-secure-store-service
https://de.wikipedia.org/wiki/SharePoint
https://www.c5insight.com/Resources/Blog/tabid/148/entryid/337/Tips-to-Avoid-Login-Prompts-in-SharePoint.aspx
https://sharepoint.stackexchange.com/questions/145921/remove-domain-prefix-for-sharepoint-2013-login
https://sharepoint.uservoice.com/forums/540331-sharepoint-mobile-app-for-android/suggestions/16367923-please-allow-to-connect-with-sharepoint-2013-on-pr