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https://support.microsoft.com/de-de/help/4045856/user-name-not-recognized-when-signing-in-to-ndes-connector-ui
https://social.technet.microsoft.com/Forums/en-US/35fb28f9-441c-4633-b977-c800dac5a7be/error-quotuser-name-not-recognized-this-user-is-not-authorized-to-use-windows-intunequot?forum=microsoftintuneprod
https://support.microsoft.com/en-gb/help/4045856/user-name-not-recognized-when-signing-in-to-ndes-connector-ui
http://www.djordjepejic.com/solved-user-name-not-recognized-when-signing-into-intune-from-intune-exchange-connector/
https://becomethesolution.com/blogs/iphone/user-name-not-recognized-intune-iphone
https://www.risual.com/2015/06/29/cant-enroll-device-for-user-and-this-user-account-is-not-authorized-to-use-windows-intune/
https://support.office.com/en-us/article/troubleshoot-device-enrollment-with-mdm-for-office-365-c863b2bf-45f3-483a-ba05-29fc7f4d6434
https://blog.ctglobalservices.com/configuration-manager-sccm/kea/unknown-error-creating-the-intune-connector-in-configuration-manager-cb/
https://www.anoopcnair.com/how-to-integrate-intune-with-sccm-cb-current-branch/
https://github.com/MicrosoftDocs/IntuneDocs/blob/master/intune/troubleshoot-device-enrollment-in-intune.md
https://mpnmexico.files.wordpress.com/2011/05/lab-1-learning-windows-intune-account-basics-student.pdf
https://de.slideshare.net/Microsofteduk/windows-intune-getting-started-guide
https://www.drupal.org/project/drupal/issues/2488784