A SharePoint group is a collection of users who all have the same set of permissions, or permission level. Certain groups are created by default when you create a SharePoint site or activate certain features, these are known as the default SharePoint groups. The default groups use default permission levels to grant users rights and access.
Each SharePoint site has three associated groups (AssociatedOwnerGroup, AssociatedMemberGroup and AssociatedVisitorGroup) who define which SharePoint groups are designated as Owners, Members or Visitors groups of a site respectively. When role inheritance is broken, by the default these SharePoint groups are “<sitename> Owners”, “<sitename>” Members and “<sitename> Visitors”.
When these associated groups are not created on site creation or when one or more of the associated groups are deleted, you need to (re)create those associations (if you want the default Owners, Members and Visitors groups as SharePoint creates them). Unfortunately SharePoint doesn’t offer an intuitive interface to do this.
Create the missing SharePoint groups
To restore the default SharePoint groups, you first need to make sure the default groups exist. Go to <site URL>/_layouts/15/groups.aspx to make sure the following groups are present:
- <site name> Owners
- <site name> Members
- <site name> Visitors
If not you have to create the missing manually (New > New Group) with the corresponding permission levels, as shown below.
Set the SharePoint groups a default groups
When the default groups are present, you have to create the associations. Go to <site URL>/_layouts/15/permsetup.aspx and select the corresponding default groups in the form.
Finally, press OK to create the associations. Now the default SharePoint groups of the site are restored.