How to force regeneration of Exchange Online Offline Address book?

[OneTechBeyond]

I have just added a large number of new users to my Office 365 tenant, and want to be able to have users download a current Address Book to their Outlook 365 clients?   Is there a way I can do this through the Office 365 Admin Portal, or is this something that I need to trigger via PowerShell?

[#2]

If I recall correctly it’s possible to force a sync via PowerShell! I think you need correct permissions for the user executing the command,

[#3]

They should be available immediately using the Online GAL but as far as I'm aware the offline address book is processed by Outlook every 24 hours as a local download

Happy to be corrected though. I know you can force Outlook to do a offline address book refresh but that command would be aimed more toward the local client then in 365

[#4]

Yes, it is 24 hours based on my experience (if i change name or add someone updates usually appear in Outlook and Skype (as it uses OAB) next day). I'm not aware of a way to force OAB update on the clients from Admin Center or PowerShell. I think this is a client-side only function.