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Open ArcGIS CityEngine on your computer.
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In the sign-in dialog box, select Sign in using a browser.

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When your browser opens to the ArcGIS login page, choose Your ArcGIS organization's URL.
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Type unccharlotte into the URL field and click Continue.
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On the Charlotte Single Sign-On (SSO) page, enter your NinerNET username and password.
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When prompted by Duo Multi-Factor Authentication, approve the login request on your mobile device.
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Return to the ArcGIS CityEngine application once your browser displays the message: "Sign in from CityEngine complete, You can close this tab." ArcGIS Online will automatically assign your license and complete the sign-in process.