Submitted application on October 23, 2021
Ghost email received on December 22, 2021
Linked application on IRCC account on January 10, 2022 with file number appeared in the account.
For those who want to know the process to link application, follow this page:
https://www.canada.ca/en/immigration-refugees-citizenship/services/application/account/link-paper-online.html
I was able to link the application by UCI, PA family name, PA passport, and number of persons in the application I filled 4(PA+PA Spouse+Sponsor+Co-signer)