Error while creating user account

Summary:

Content (please ensure you mask any confidential information):

Receiving the following error while creating the user account of worker. Have hired an employee , now trying to create user account.

"java.lang.RuntimeException: Failed to create user lisa.spencer1@yopmail.com"

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

25a

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