Hi @Handian Sudianto ,
Is outlook have interval to sync the user properties from AAD? If yes, can we force manually to do the syncronization?
Based on my experience, it does require some patience for the change of user properties in AAD to be reflected in Outlook or OWA.
But as per your concern about the interval, I tried searching a lot but so far haven't see it mentioned in any official document about the specific sync interval. And currently, I am afraid there isn't a way to force it to update straight away.
With the above being said, I'd suggest giving it a few more hours for the change to reflect in Outlook clients.
Meanwhile, I've also tried submitting a suggestion via the dedicated feedback portal for Exchange Online. The link would be left below so that you or others can vote on it as well.
https://feedbackportal.microsoft.com/feedback/idea/c73ad87f-bcad-ed11-a81b-000d3a0450e3
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