Add contacts to all mailbox folder in Exchange Online

[Kiril]

I want to add a contact to all contact mailbox folders on our Exchange. How should I proceed?

Use case is: we have a few emergency contacts in our organization and we want that every employee has that contact. So, I need to add the emergency contacts somehow to all contact folders in Outlook of all our employees.

[#2]

You will need a Graph API or EWS-based solution. Here's one PowerShell module that uses EWS: https://github.com/gscales/Powershell-Scripts/tree/master/EWSContacts

[#3]

Thank you! How could I do it using the Graph API?

[#4 · Accepted solution]

Use the corresponding Graph endpoint: https://docs.microsoft.com/en-us/graph/api/user-post-contacts?view=graph-rest-1.0&tabs=http
Or use something pre-built: https://github.com/gscales/Exch-Rest