Did you ever find a solution? I'm getting the same problem https://learn.microsoft.com/en-us/answers/questions/803076/graph-how-to-add-properties-on-profile-card.html
Graph API - Create profileCardProperty Not Showing on Contact Card
MacKay, Sarah
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We are trying to add an employeeID field to our O365 Contact Cards. The field is already available in Azure AD. We followed the steps in the below article logged in as a Global Admin with User.ReadWrite, -or- User.ReadWrite.All permissions.
We received a success(200) response. I can see the added field under additional information on the Delve profile, but not on the contact cards. It has been more than 24 hours since we ran the query.
Any thoughts on how to get this to display on the contact cards? Thanks!