Using the Outlook mobile add-in in Government Community Cloud (GCC) environments - Signature 365

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

On Android devices, the add-ins option is not listed under the settings menu. On iOS devices, opening add-ins reports "This account does not support Add-ins"

To resolve this, the Microsoft 365 tenant must be modified through Exchange Online PowerShell to allow the use of Outlook Mobile add-ins.

Connect to Exchange Online: and log in with a Global Administrator account:

Connect-ExchangeOnline

When connected, use the following command to disable add-ins on mobile devices:

Set-OrganizationConfig -OutlookMobileGCCRestrictionsEnabled $false

You can check this setting using the following command:

Get-OrganizationConfig | fl OutlookMobileGCCRestrictionsEnabled

Which will return the following when disabled:

PowerShell output showing OutlookMobileGCCRestrictionsEnabled set to False

Using the Aptos font in Signature 365

Use Aptos in Signature 365 by installing the font on sending and receiving devices, despite browser and OWA limitations.

Frequently asked questions

Common questions and answers about Signature 365