I've been doing some investigating and apparently a user's birthday date (the one that shows up on Delve) is not stored in a property inside the user's own office365 account object.
I'm trying to create a PowerShell script in Azure where I can update a user's birthday with a value that is currently in a SharePoint list. As of right now if I could find out how to even set the birthday property hard-coded, that would be some progress.
Get-MsolUser and Set-Msoluser don't work because as I stated previously the birthday date isn't there for some reason, but I can retrieve a user's birthday utilizing Microsoft Graph and sending a GET request to this URL of the API
The response of that request is what I would like to be able to automatically set, but I can't seem to find a way to do so.