Modifying Mailboxes using delegated partner credentials This topic contains 1 reply, has 2 voices, and was last updated by Cyril Muffat 1 year, 2 months ago. Author Posts March 29, 2017 at 11:20 pm #67575 Michael OrellanaParticipant My goal: To be able to administer our partner mailboxes i.e. Converting mailboxes to shared, set forwarding rules etc.. in powershell Current status: Script works as it should, connects me to my partners exchange online environments. Running Get-mailbox works fine; however, when we get to changing mailbox information it gets tricky. Issue: When I run the command below I receive the error: The remote server returned an error: (401) Unauthorized... Set-Mailbox -Identity email -Type Shared Oddly enough, if I run the command below, I get no error at all it commits the change of display name just fine. Set-Mailbox -Identity email -displayname NewName I have a test tenant I can work with that is solely in Office 365, meaning no hybrid configuration. I will happily paste my script however It keeps getting blocked as spam even after me sanitizing it of all confidential info (it doesnt have any to begin with). March 30, 2017 at 6:42 am #67582 Cyril MuffatParticipant Have u checked ur rights on the mail box for ur user ? https://technet.microsoft.com/en-us/library/aa998218(v=exchg.160).aspx Get-mailboxperm Author Posts You must be logged in to reply to this topic.