I called customer service, and it turns out my employment expenses were not being calculated because I selected that I'd be claiming work from home expenses on the T4 slip page (at the bottom, it mentions covid-related expense, with a yes/no selector). This apparently only lets you claim expenses if you ALSO select T2200s.
If you have a T2200, then you have to select NO at the bottom of the T4 slip page.
All good now!
