Looking for logging into the Failed For User Your_username 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 Failed For User Your_username site. After that you can login as usual with your login credentials.
https://dba.stackexchange.com/questions/141239/login-failed-for-user-on-sql-azure-from-azure-hosted-web-application
https://stackoverflow.com/questions/50539077/how-to-debug-login-failed-for-user-on-an-azure-sql-database
https://social.msdn.microsoft.com/Forums/Lync/en-US/f9a49c57-4da0-45af-a742-c5556d0f35d6/login-failed-for-user-when-using-admin-user-in-ssms?forum=ssdsgetstarted
https://serverfault.com/questions/2218/sql-server-issue-login-failed-for-user-username
http://itproguru.com/expert/2014/09/how-to-fix-login-failed-for-user-microsoft-sql-server-error-18456-step-by-step-add-sql-administrator-to-sql-management-studio/
https://github.com/markrendle/Simple.Data/issues/263
https://support.solarwinds.com/Success_Center/Orion_Platform/Knowledgebase_Articles/System_Data_SqlClient_SqlException_0x80131904_Login_failed_for_user_SolarWindsOrionDatabaseUser
https://blog.clock-up.jp/entry/2016/08/20/aspnet-username-sql-error
https://forums.asp.net/t/1151083.aspx?System+Data+SqlClient+SqlException+Login+failed+for+user
https://www.experts-exchange.com/questions/26624564/OPENDATASOURCE-Sometimes-fails.html
https://www.earthsystemcog.org/projects/cog/doc/esgf/faq/login
https://mycyberuniverse.com/how-fix-fatal-authentication-failed-for-https-github-com.html
https://data36.com/data-coding-101-install-python-sql-r-bash/