Thanks for taking the time for looking at this!I think you're starting from the wrong web page, try here:
https://www.canada.ca/en/immigration-refugees-citizenship/services/work-canada/permit/temporary/apply.html
Note, not saying this will work for you (if I understand the out of status issues described above), but you should not get whatever message it is you're getting.
(And a pointer: if you're saying you're getting weird messages, include the link of where you're starting from - otherwise often impossible for others to figure out what the issue is)
This is the link that I was using for application thorrough IRCC portal account. https://portal-portail.apps.cic.gc.ca/home?lang=en
In the link that you have provided, it asks to create a GC key account which I already have, but I am issue in the application. I wish I was able to include some screenshots in this message to show where I am encountering the issue