Oh, ok. I am from NB. I got my GCMS notes on May 30th. It indicated my COPR doc # there. I then created an account in the PR portal. But since I don't have the COPR doc # of my dependents, I emailed ATIP with the consent forms so I can be given access to their information. I received an e-mail saying that I have to make another request online for that since it wasn't indicated in my initial application.
Then I emailed the IRCC Client portal asking them for a link to the invitation on June 6th. I also provided my file number as well as our names, UCIs. Original Entry Dates, Last Entry Dates, and Port of Entry. Last night, my dependents all got the emails with the temporary password.
I figured that since you already did everything, might as well try this last one. It might work for you, too. Just worth a shot.