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Cannot add a "contact" in Exchange Online to an Office 365 Group as a Guest
Looks like this is an issue - I have successfully been able to add external recipients as guests in an Office 365 Group if they are not listed in the GAL, however when I come to add a contact listed ...
Thanks George Khalil for reaching out! Currently adding of mail contacts as guest is not supported, however there is way you can add mail contacts for which you would need the administrator to remove the other mail-enabled object, after which the guest user object can be added by the group owner or by an administrator running cmdlet with mSExchHideFromAddressLists property as $false, this property would ensure that the contact is visible in GAL.
You can refer tenant admin documentation https://support.office.com/en-us/article/Guest-access-to-Office-365-groups-Admin-Help-7c713d74-a144-4eab-92e7-d50df526ff96?ui=en-US&rs=en-US&ad=US
Alternatively there is a very good and informative article written by TonyRedmond https://www.petri.com/external-access-office-365-groups about guests in Groups, which includes details about Guests in Groups.
Sahil Arora
Microsoft
MicrosoftThanks folks for the feedback! This is something that we are actively working on for first half of 2017. We will keep you posted with updates.
Wow this is a really big limitation. This afternoon I put aside time to move a bunch of our groups from Linux MailMan to 365 Groups and fell at the first hurdle. It is very probable that the sort of "guest" users you will want to add to such a group would already reside in the GAL as a contact. Especially an organisation that is membership based like we are.
Shame.
Be good when thius is fixed.
