To add members to your community, the user must be registered to GCX first before you can find and add them. 


This can be done on both SharePoint and Teams. 


To add members using SharePoint, click on members top right corner of your community, click add members 


You search users by either full email or their names. This will also let you select their roles.




To add members using Teams


Open your GCX Teams on the browser or app. Click on the 3 dots in front of your community name, and click on Add member.


Alternativement, click on the 3 dots in front of you community name, click on Manage team, then  add member





You can change members Roles on the same page as well. Members to Owners and vice versa.