email address and user name change impact on workflow

Summary:At my current client place people keep changing department and when department changes, they change email address and user name too . I am worried and as per SR this will have impact on workflow approval . How do you handle this situation

Content (please ensure you mask any confidential information): Same as above

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

Fusion Cloud Applications 25A

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