New employer users to MNSchoolJobs.org are sent an invitation email with the subject line, "Invitation to Join <employer name> Account on MN School Jobs". The invitation email includes a link that will activate the user account, and that link expires 72 hours after delivery.
When an invitation link has expired you will see the "Invalid Link." message (we're working on making this message more useful.) The invitation email can be sent by an administrative user in your employer account, or email support@mnschooljobs.org and we'll reissue the i nvitation.