How to use the Outlook Add-In in Microsoft 365 GCC environments

Scenario

You are trying to use the Exclaimer Outlook Add-In via a Microsoft 365 GCC environment and notice that on Android devices, the Add-In option is not listed under the settings menu. Alternatively, on iOS devices, trying to open the Add-In gives the following error:

Reason

By default, Microsoft 365 GCC environments are configured to prevent the use of mobile add-ins and will prevent these from being loaded on a device even when deployed from the Microsoft 365 Integrated Apps portal.

Resolution

To resolve this, you must use Exchange Online Powershell to modify the Microsoft 365 tenant to allow the use of Outlook Mobile add-ins.

To modify the tenant using Powershell: 

1. Open Exchange Online Powershell and enter the folloing command:

   Connect-ExchangeOnline. Log using Global Administrator credentials.
    

2. Enter the following command:

   Set-OrganizationConfig -OutlookMobileGCCRestrictionsEnabled $false
    

3. To check the status of this setting, enter the following command:

   Get-OrganizationConfig | fl OutlookMobileGCCRestrictionsEnabled

   The status should display as False. 
   
   
   _{The setting in Powershell, showing the False value.}
    

4. If the status displays as True, enter the following command:

   Set-OrganizationConfig -OutlookMobileGCCRestrictionsEnabled $false