Hi I am in same boat. I received the link on Monday, June 27.
I raised a technical issue on https://secure.cic.gc.ca/ClientContact/en/Technical/Form/81
I emailed to IRCC.ClientPortalPrairies-PrairiesClientPortail.IRCC@cic.gc.ca and
IRCC.ClientPortal-PortailClient.IRCC@cic.gc.ca.