In some instances, when attempting to access the Portal Administrator Directory, the following error message is returned:
Error: Administrative access is disabled. Please contact your system administrator to enable it.
To resolve the error, configure the web adaptor to enable administrative access to the site. Refer to ArcGIS Enterprise: Configuring the Web Adaptor from the configuration web page for more information. If the issue persists, ensure the Portal Administrator Directory URL follows the format below: