I was finally able to register for the tracker. In my case, the place of birth caused the issue. I tried place of birth same like in passport (City, State) but didn't work. I checked my last application to IRCC, Which is PGWP. So in my PGWP, my place of birth is (City, State.) There is an Extra (.) in the PGWP application i submitted to IRCC. Now it worked when i registered with (City, State.)
Please check if you applied to IRCC before and what place of birth you mentioned in previous application.