The documentation portal is undergoing maintenance. During this period, you can't create any new user credentials. If you do, you'll need to recreate the user credential after the maintenance period ends.
Make sure that any style sheet that is created for Data Discovery is copied to the ./webapp/xsl folder for all Tomcat engines so that you can access the reports from any of the ILM instances. Use symbolic links to synchronize the style sheet directories of all Tomcat engines with one base directory in the same way you use symbolic links to synchronize the Data Vault directories.