Every VO is tagged by their e-mail address prior @cic.gc.ca
Calgary: IRCC.ClientPortalPrairies-PrairiesClientPortail
Etobicoke: IRCC.ClientPortalOntario-OntarioClientPortail.IRCC
VLU OTTAWA: IRCC.ClientPortal-PortailClient.IRCC
Montreal: IRCC.ClientPortalEast-EstClientPortail.IRCC
Niagara...