If Attestation is configured for a group, and the number of days to recertify has passed, then all group admins and updaters will receive an email with a link to the group. At the top of the group information page will be a message that the group needs to be attested with a button to mark the group as reviewed.
The email will have a link to the group.
The information page for a group that needs to be attested. Select the button Mark group as reviewed to attest the group.