How to Enable OrganizationCustomization in Office 365

Enable Organization Customization

You may be prompted to run the Enable Organization Customization cmdlet before you create or modify objects in your Exchange Online organization. Here are some examples of when you might see this:

• Creating a new role group or creating a new management role assignment.
• Creating a new role assignment policy or modifying a built-in role assignment policy.
• Creating a new Outlook on the web mailbox policy or modifying a built-in Outlook on the web mailbox policy.
• Creating a new sharing policy or modifying a built-in sharing policy.
• Creating a new retention policy or modifying a built-in retention policy.
• Enabling preset security policies in the Microsoft 365 Security Center.

Connect to Exchange Online Powershell

1. Right click on Start icon then open Windows Powershell Admin.

2. Copy then paste all below commands into PowerShell window to install required modules and connect to Exchange Online PowerShell.

Set-ExecutionPolicy -ExecutionPolicy RemoteSigned -Scope LocalMachine -Force;
Install-PackageProvider -Name NuGet -Force;
Set-PSRepository -Name "PSGallery" -InstallationPolicy Trusted;
Install-Module -Name ExchangeOnlineManagement;
Import-Module ExchangeOnlineManagement;
Connect-ExchangeOnline;

3. Once you connected to Exchange Online, run the following command to check the status. 

Get-OrganizationConfig | Select-Object IsDehydrated

True ($true) = the command has never been run.

PS C:\Users\mpnadmin> Get-OrganizationConfig | Select-Object IsDehydrated

IsDehydrated
------------
        True

4. Now, run this command to enable organization customization.

Enable-OrganizationCustomization

5. How to know it works. False ($false) = the command has already been run

PS C:\Users\mpnadmin> Get-OrganizationConfig | Select-Object IsDehydrated

IsDehydrated
------------
       False