Why can’t I edit my own contact info in Global Address List of Outlook client?

Why can’t I edit my own contact info in Global Address List of Outlook client?

The environment is on-premise exchange server 2016, in the ECP/Exchange Admin Center I already have user accounts set up with

Our outlook client version is the latest Microsoft Office 365,

In the past at other places I was able to within the GAL field itself on the client version of Outlook to directly edit my own self contact info, etc (and so did every other user) without having to go to the OWA or use a browser and without having to use RSAT/ADUC tools etc

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