Hi @Carl Jones
Thank you for posting your question in the Microsoft Q&A forum.
Based on your description, looks like you want to allow users to edit the information themself.
Can you please check if you the users can update their information via Outlook > Org Explorer > Update your profile.
Additionally, I've done some research and there is no direct way to let users change their information for On-Prem environment.
And giving users permissions to edit the information is also not recommended. This can cause some unintentional risks.
I hope this information helps.
Please feel free to reach out if you have other questions.
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