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This is Exchange on-premises server mailbox account, and it does not have an Exchange Online mailbox. I suppose the API can work in hybrid deployments?
*If I use another O365 account to login and try to get this mailbox schedule via "/calendar/getSchedule", it works.
In order for the Graph to be able to access on-premises data, you need to configure integration as detailed here: https://learn.microsoft.com/en-us/graph/hybrid-rest-support#requirements-for-the-rest-api-to-work-in-hybrid-deployments
Thanks @Vasil Michev , I have talked to our IT guy and seems all the requirements already met.
In fact, I can use another Exchange Online account to look up schedule of this on-premises mailbox
(I signed in as [hkroom707] and query about [hkroom701], [hkroom701] is the on-premises mailbox.
Try using the actual userid instead of the /me endpoint?
I tried, the same 404 return.
