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.
Effective in version 10.2 HotFix 1, you can use the Informatica PowerCenter Docker utility to create the Informatica domain services. You can build the Informatica docker image with base operating system and Informatica binaries and run the existing docker image to create the Informatica domain within a container.