Sync O365 global Outlook address book with Zoom Phone contacts

We are replacing our existing phone system companywide with Zoom phones.  A requirement of the project that we must sync our O365 exchange address book to the Zoom Workplace Phone contacts.  It seems the only way to currently do this is every user must manually download their contacts from Microsoft 365.  

We have tried different methods to automate this site wide which has failed. I understandable for O365 to sync admin permissions must be given and that task has been completed.

If a solution can be found to automatically sync O365 exchange global address book with Phone contacts, this will be a no go with the department of over 300 phones as the upper managers will review this phone system is not working for then because they need to call up saved contacts.

 How do I sync O365 address book contacts into Zoom Phone contacts without having ever user forced to manually do it and continue to this process over and over again for new global contacts are added to the address book?

Thank you,