I'm trying to download emails from In-Place Archive mailbox in office365.
Looks like Outlook API didn't support it last year How to get In-Place archive mailbox in Exchange Online using Office 365 APIs
And a recent question regarding Graph API didn't get any response in Access In-Place Archive with MS Graph
Was anyone successful using unmanaged EWS API?
We are looking into this scenario now and hope to have a solution on MS Graph soon(can't promise any timelines yet).