I'm not sure if this is still the case, but at least back then (10+ years ago), quite a few people working helpdesk and IT (system admin, network admin, etc.) were CS majors. Or at least it seemed so from my own network. CS was seen as the gateway degree to any kind of computer related career, not just SWE. Are things different now?
I am actually not a CS major - I'm an information systems major. Funny enough, another IS major friend and I ended up as SWEs (him at a FAANG at that), while a whole bunch of CS major friends are working in IT as system or network admins or helpdesk managers.