Medical and Bio are sent via email. If you have a representative then they receive it.
NOTE:
When my rep received the biometrics request, he forwarded it to me. I, then logged in to Ecas and saw the line "medical request has been mailed to PA" message...I immediately contacted my rep and sent him a screen shot of that line from ecas. He at first was in denial that they have not received any email about medical. After I insisted he contacted IRCC and they resent the medical.
So always check ecas and your spam/junk folders.