X-MS-CLIENT-PRINCIPAL-NAME has become populated with anonymised names overnight, how can I revert this?

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I have an azure app service that receives requests from authenticated users on our subscription, until today everything worked fine but now for some reason the emails that used to appear in the X-MS-CLIENT-PRINCIPAL-NAME header are now anonymised, e.g. john.smith@company.com -> j******@company.com.

We need to be able to record the user interacting with certain elements of our app service, this change has broken that logging and has occurred without warning or any update to documentation that I can find, please let me know if I've missed something.

Many thanks

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