Graph Explorer

Occasional Contributor

I've started to use the Graph API as part of some Power Automate Flows to get at some data that isn't otherwise exposed and it works great!  I tend to use Graph Explorer to test out the results etc so I can plan what I'm doing but I recently hit an issue using https://graph.microsoft.com/v1.0/users/{UserID}/mailboxSettings 

This will only return data for my mailbox, for any other mailboxes it says I need to grant permissions but the permissions have been granted.  Doing it in Flow works fine but I just don't understand why it won't work in Explorer.  Anyone have any ideas? 

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