As you know, we can finally add external users to Office 365 Groups without having to make many additional configurations in our tenant (By default, this feature is not enabled at the tenant level). If you want to enable this feature in your Office 365 tenant, just follow bellow steps:
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In the Office 365 Administration portal, click on Settings –> Apps.
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In the Apps page, you will find and Office 365 Groups section:
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In the Office 365 Groups settings panel you will be able to configure two settings in regards of Guests support:
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Enable or not if Guests can access to Group resources.
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Enable or not if Group owners can add Guests to Office 365 Groups.
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