bill management

Summary:Unable to register self-service user in Bill management from UI.

Content (please ensure you mask any confidential information):

Unable to register self-service user in Bill management from UI.

System is not registering the Self-Service User from UI. it is sending me back to search screen as soon as i click on register user button.
Customer account is active
Customer contact details are active, Email are active.
Role type: Contact
Account Type : External.

Version (include the version you are using, if applicable):

25C (11.13.25.07.0)

Code Snippet (add any code snippets that support your topic, if applicable):