Without AOR, you will not have an application number if you don't have an application number, they will not able to link your webform to your application.
If you have a UCI number, submit a webform anyway, it will be stored in the database(as a record) and you can tell them later you tried to let them know as soon as you figured out the mistake, and give IRCC a call and talk to an agent and let them know. That call will also be recorded. We are human, we make mistakes, nothing to worry as long as you let them know before they find out.