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https://support.microsoft.com/en-us/help/943027/error-message-when-you-try-to-delete-a-user-through-microsoft-dynamics
https://www.gpug.com/communities/alldiscussions/viewthread?GroupId=247&MID=6804
https://www.erpsoftwareblog.com/2017/08/tip-sheet-deleting-dynamics-gp-user-id/
https://community.dynamics.com/gp/f/32/t/103202
https://community.dynamics.com/gp/f/32/t/112761
https://community.dynamics.com/gp/f/32/t/99369
https://www.mig.com/blog/dynamics-gp/fix-the-creation-of-the-login-failed-for-an-unknown-reason-error/
https://chayadigital.wordpress.com/2014/04/15/fix-for-unable-to-delete-microsoft-great-plains-user/
https://forum.mibuso.com/discussion/57325/nav-2013-upgrade-from-nav-2009-login-failed-for-user-error
https://stackoverflow.com/questions/10187737/coldfusion-could-not-delete-the-file-for-an-unknown-reason
https://community.netgear.com/t5/Using-your-ReadyNAS-in-Business/Backup-Failure-quot-due-to-unknown-reason-quot/td-p/961732
https://community.secondlife.com/forums/topic/363078-login-failed-fixed/
https://support.plesk.com/hc/en-us/articles/213398569-Unable-to-remove-database-Delete-database-user-failed-Database-example-db-does-not-exist