When you want to access your own mailbox info you will be using "GET /me/mailboxSettings". In case of accessing others, then you need to use the API call like, "GET /users/{id|userPrincipalName}/mailboxSettings". In addition, make sure that you provide the necessary permissions as provided in the graph documentation.
Mailboxsettings in Graph Explorer
Robson, Dan
1
Reputation point
Simple query to get mailbox settings for a user in the tenant but it won't return results, only appears to work for getting my own mailbox settings, is there no way to grant the permission to read all mailbox settings?
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Deva-MSFT 2,256 Reputation points Microsoft Employee
2021-06-02T11:59:43.687+00:00