Oí just as a little heads up for a solution that may help.
The cra system is very sensitive with spelling and information.
Have the document that states ur sin near. This is because u will want to enter information like name and apartment/address in a format that looks similar to it. FOR EXAMPLE IF UR NAME IS IN ALL CAPS IN THE SIN DOCUMENT (that got mailed to u) then u need to do exactly that. Also pay attention to the document to see if they didn't give u a middle name but instead placed it in the first name row.
(By the way I used HR block and this was my first filing too)
