Did directly ask for biometrics on a separate email? In my case the Sponsor Approval Letter indicates:
Biometrics (if applicable): On July 31st, 2018, biometrics became a requirement for some IRCC applicants. If your relatives are required to complete biometrics, they would have received a request for fees and an instruction letter with details on how to submit biometrics.
Does that mean if we have not received a separate request for biometrics we should not worry about it? My mom lives in Canada and was here at the time of application too. (I paid the biometrics fee at the time of application to be safe but I am hoping we are not required to provide biometrics as my mom is in Canada and her online application shows a valid biometrics code on file which is valid for few more years).