"None of your accounts are a member of XXXXX" trying to set an app group
<p>I've developed an app for a customer who has their own Apple account and profiles etc. 
They have given me their development profiles and dev keychain certificate and want me to deliver the app to them signed with their dev profiles which they will then replace with app store distribution profiles.</p>

<p>I'm having a problem adding an app group to the capabilities. When I click on the + button to add an app group I get the following error:</p>

<p><a href="https://i.stack.imgur.com/R7HLz.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/R7HLz.png" alt="enter image description here"></a></p>

<p>This is the signing settings. When their developer provisioning profile was imported as the signing profile XCode set the Team to "Unknown Name (XXXXX)" so it must have pulled that team name from the profile.</p>

<p><a href="https://i.stack.imgur.com/E8Ohv.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/E8Ohv.png" alt="enter image description here"></a></p>

<p>In XCode's accounts I only have my own Apple IDs added, I don't have their Apple ID added (its not possible to without knowing their password though?, something I won't get). I presume this might be why I am getting that error code?</p>

<p>Is there anyway of adding the group id to the project without having to add their Apple ID to XCode's account section?</p>