Just to add, you might try calling them again and hear a second opinion from a different agent and If you you are advised same as the earlier agent then it might make sense to wait since they might be more informed than we are.Hi, I submitted in Jan 2020 without filing my tax since you can only file in March, my application is currently in process status like everyone else. So the short answer is that you can and I advise you proceed, as long as you check the box for them to access your NOA from CRA, considering you must have filed before your application gets to the stage where this will be required they will be able to pull this as well. Although I have heard there are inconsistencies depending on the officer processing your file but I don’t see what you have to lose by going ahead with the application now, if they return it then you resubmit.
Hope this helps!
Goodluck!