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The ArcGIS Pro Sign In dialog box hangs, causing log in attempts to fail, which can prompt errors relating to certification, licensing, or an invalid username.
The ArcGIS Pro registry entry is corrupt. This may occur when multiple versions of ArcGIS for Desktop are installed on the same machine and the environment variable settings in the operating system's registry is modified to accommodate this scenario.
The following workarounds are possible solutions for this problem.
Note: Before beginning, verify that an active ArcGIS Pro license is allocated. The following ArcGIS Online Help document describes how to do this: Manage licenses.Workaround 1: Rename the ArcGIS Pro folders
Note: The AppData folder is a hidden folder. The following Microsoft Support document describes how to show hidden files: Show hidden files
Note: Renaming the ArcGISpro folder resets ArcGIS Pro. Launch ArcGIS Pro to recreate the ArcGIS Pro folder.
Note: The ProgramData folder is a hidden folder.
Note: Renaming the FLEXnet folder resets FLEXnet. Launch ArcGIS Pro to recreate the FLEXnet folder.
Warning: The given instructions include making changes to essential parts of your operating system. It is recommended that you backup your operating system and files, including the registry, before proceeding. Consult with a qualified computer systems professional, if necessary. Esri cannot guarantee results from incorrect modifications while following these instructions. Therefore, use caution and proceed at your own risk.