If I'm not mistaken only one person can link the application and that's either the applicant or the applicant's agent. The sponsor has a separate access to check on Sponsor eligibility approval progress. Any notification to the sponsor from IRCC goes to the sponsor's email and any correspondence from IRCC to the applicant goes to the applicant's email or his / her representative.I am wondering this myself too as I am in the same situation. Hopefully someone here knows
My sponsor uses only the ECAS to check for updates.