New hire accounts are being locked before users even try to log in

Summary:

Randomly, some new hire accounts are showing as locked which is preventing security roles from being assigned. Is there some setting or process that is auto locking them or some parameter that could be causing the issue

Content (please ensure you mask any confidential information):

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

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