I was going through the API documentation provided on your website, but I could not find standard API to access Federation status of the users in a team.
Is there a direct API to access the federation status of the users in a team ??
When looking to get the users information of your portal, you can refer to this endpoint: Get Owners | Owners API. The example response indicate all the users information that the endpoint covers and there isn't a property named Federation status and so the Federation status information isn't cover.
That said, do you mind sharing what's a Federation status?