On-Prem O365 mailboxes and mailbox calendar delegation issues

1. onprem default organization sharing policy exchange, open calendar details;

2. Run the following command on onpre exchange2016. (Exchange2010 no such command)

Set-OrganizationConfig -ACLableSyncedObjectEnabled $true

3. Modify mailbox msExchRecipientDisplayType 365 AD attribute. Command is as follows; the order is for all 365 email account. Execute commands locally;

Get-RemoteMailbox -ResultSize unlimited | ForEach {Get-AdUser -Identity $_.Guid | Set-ADObject -Replace @{msExchRecipientDisplayType=-1073741818}}

Or execute the following command in the ad

Get-ADUser -Filter * -Properties msExchRecipientDisplayType | where {$_.msExchRecipientDisplayType -eq -2147483642} | Set-ADUser -Replace @{msExchRecipientDisplayType = -1073741818}

4. After the command is executed successfully, wait outlook address book updates, can be used.

Note: Step 3 After command is executed, if the new migration from exchange2010 to 365, step 365 performs the migration operation is complete 3 must account for this new migrated; command is executed after the step 3, if the transition from 365 to exchange2016 , you do not need to do anything this migration account.

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https://docs.microsoft.com/zh-cn/exchange/hybrid-deployment/set-up-delegated-mailbox-permissions

http://www.expta.com/2018/04/cross-premises-mailbox-delegation-in.html