As the sponsor I was able to link it to my account.Extract from:
https://www.canada.ca/en/immigration-refugees-citizenship/services/application/application-forms-guides/guide-5525-basic-guide-sponsor-your-spouse-partner-child.html#expect
Step 8: After you submit your application
Communicating with IRCC
There are several ways we may communicate with you:
Do not attempt to link your application to your personal online account if you have appointed a representative. If you have appointed a representative and attempt to link your application to your own online account, you will have to cancel your representative before you can link.
- Through your (or your representative’s) online account: We recommend that you or your authorized paid representative (if applicable) create an online account and link your paper application to that account. Once an application has been linked to an online account, we will send correspondence there. This makes communication easier, more secure, and quicker and will allow you or your representative to get more detailed application status information and to receive mail from us online. Using online services will ensure that you receive any correspondence (including medical forms and other requests) from us almost immediately after we send it to you. This will allow us to input your responses directly into your application for timely review. Get more information about how to link your paper application to your online account.
- E-Mail: If you or your representative provide us with an e-mail address when you apply, this will be our primary means of contacting you, unless your application is linked to an online account.
- Mail: If your application is not linked to an online account and no e-mail is provided, we will send all correspondence to the most up-to-date mailing address we have on file.
If you have an authorized paid representative, they can link your application to their own online account instead.
Unpaid representatives cannot use online accounts. If you have an unpaid representative, you should remind them to regularly monitor their e-mail and mail to ensure correspondence is received.