Unexpected change in group membership
Problem: A group member disappears from the group, or has their email address change, without any action on your part as administrator.
Possible cause: Changes to another Google account that's associated with the group member. You add a group member using their email address. However, if the email address you're adding is associated with a different Google account, either as a primary, secondary, or alternate email for that account, then that Google account is also linked to the group, and changes to that account will affect group membership.
Example: You add a group member with the email address firstname.lastname@example.org. This address is also set up as the alternate email address of the Gmail account email@example.com.
This now links the Google account associated with firstname.lastname@example.org to the group. Here are some possible outcomes:
- If John Doe deletes the Google account associated with email@example.com, firstname.lastname@example.org will disappear as a member of the group.
- If John Doe removes email@example.com as the alternate email address for firstname.lastname@example.org, then email@example.com (the primary email address of the underlying Google account) starts appearing as a member of the group. Also, messages sent to the group are now delivered to firstname.lastname@example.org (not to email@example.com).
Investigate email removals or replacements
The way Google Groups manages memberships through accounts doesn’t affect members without an associated Google account. For them, only administrators or managers of G Suite domains can change their group membership.
Administrators can use the Groups audit log to help answer questions about changes to groups within the domain.