As a further update, my virtual oath was Wednesday (March 26), and I sent to oath form immediately after. I still don't have the e-certificate and the tracker has not changed.
To recap: I followed up with another email the next day, after realizing I never got the customary auto-reply, asking if they received it. I received an auto-reply to that email (with no attachment), so I emailed it again, printing the PDF to a new PDF, hoping if there was an issue with the file, a different file would help. After getting no auto-reply to that too, I sent it via the web form for "add documents to your application", since that will "timestamp" it that I sent it within the required 48 hours.
Hopefully someone will process it at some point, and hopefully I'm Canadian now, since I cut up my PR card.