So I finally managed to get my new permanent SIN after they wouldn't accept my CoPR letter (another story). So I have a SIN starting with 7, but I can't use it to log into my CERB/CRA account, it'll only work on my temporary SIN that starts with a 9. Looking online, the new SIN should have been linked, but it doesn't seem to be the case. Do i have to contact anyone to get this done? Should I just use my old sin?