Thank you. We'll take those into considerations.
We did file the 2020 taxes already.
The request for T4/NOA came on February 3
We've submitted the T4s on Feb 3. but mistakenly submitted the 2019 ones as we don't have the 2020 by that time. We also submitted these T4s together with the application package.
We filed our tax return on Feb 26
We uploaded our 2020 T4 on March 18
It looks like our 2019 income wasn't enough if 2-3 years of income is really being considered, as we only have 44kish in 2019.
Will GCMS notes make us better understand more what happened in the case?
You have to refile if you used the wrong T4. Your tax return should get flagged for incorrect information.