After an update from 13x to 23x, the following error occurs when validating platform credentials:
Logon :: Platform='BI4_PROD', User='Administrator' ==> Invalid URI: The hostname could not be parsed.
This issue can be caused by the use of multiple WACS servers in the CMS Name platform field (example: server1;server2). Build 13x supported the ability to define multiple WACS servers for fail over purposes. This functionality is not currently supported in 23x.
The Server Name must be updated to use a single WACS server. Updating the Server Name can be achieve using Update Platform.
https://help.infosol.com/solution/articles/19000016985-platform-management (see Update Platform)