If you received an e-mail with an Application number that you can use to track your application online using the online tracker, you already have AOR. AOR is "Acknowledgement of Receipt" - the email should have these words in the body. Let us know when you received this e-mail so we can update the spreadsheet. If you don't have this e-mail, it should could have gone into spam... Nothing to worry at this point since you are able to track your application online already. Your entry is in the May tab of the spread sheet (see my signature for spreadsheet link)
ECAS is available only for paper applicants. Since you are an online applicant, you only have access to the new tracker:
https://tracker-suivi.apps.cic.gc.ca/