Earlier quoted context omitted.
I agree. I never put my grades on my resume. It was what I did outside of school and how I interviewed that mattered. Don't be ashamed of your illness. Be direct, honest and proud that you got a degree at all. You presumably came out of the illness stronger and with a different perspective on life. As someone who also went through illness in the past - there is something to be said about how such illness affects one'…
Did you not put grades when you were graduating out of college? My boss considers it a big no when a recent grad refuses to put grades. I have seen that grades or even degrees do not matter when you claim experience and knowledge. But that seems not to be the case where your masters is a big talking point.
Well, sure when you put it that way it sounds bad. It's extremely common to see resumes without grades (and is often advised by career services for people with low grades). It sounds like your boss cares more about grades than someone who'll do a good job, and then that isn't a good fit for this person anyways.