Avatar of jasonkthomas
jasonkthomas
 asked on

User mailboxes that are directly created in 365 cannot be assigned permissions to mailboxes on-premise

User mailboxes that are directly created in 365 cannot be assigned permissions to mailboxes on-premise using the Add-Mailboxfolderpermission command. It reports the following error for the on-premise user "The specified mailbox identity does not exist."

Microsoft 365Exchange

Avatar of undefined
Last Comment
davorin

8/22/2022 - Mon
ASKER CERTIFIED SOLUTION
Ross McCandless

THIS SOLUTION ONLY AVAILABLE TO MEMBERS.
View this solution by signing up for a free trial.
Members can start a 7-Day free trial and enjoy unlimited access to the platform.
See Pricing Options
Start Free Trial
GET A PERSONALIZED SOLUTION
Ask your own question & get feedback from real experts
Find out why thousands trust the EE community with their toughest problems.
davorin

In Exchange hybrid configuration the sync of AD elements goes in one way - from to premise towards to O365.
If you create a user and mailbox directly in O365, on premise AD knows nothing about it, so it has problems setting permissions to an on-premise mailbox to a "stranger". This includes browsing the list of on-premise mailboxes.
You need to create a user and mailbox on premise first, sync it to O365 and then you can move the mailbox to O365.
Hybrid is not the same as having two exchange servers, but more having a copy of users with the same SID on O365.
I started with Experts Exchange in 2004 and it's been a mainstay of my professional computing life since. It helped me launch a career as a programmer / Oracle data analyst
William Peck