It almost certainly is a legal need. I don't know why you're dismissing this so quickly. Their product is the #1 access management platform for citizens to log into US government websites, I think that a lot of their employees will need basic security clearances from the US government because of their proximity to personal data.
And Canada mostly shares the same timezones and works hard to keep them in sync (e.g. daylight savings time) with US timezones exactly to allow these kinds of business dealings to happen comfortably. There are exceptions, but few Canadians live there. It is unlikely that the one asking is among the exceptional.
> Ontario is most definitely not within the Continental United States, geographically or otherwise.
Better look at a map again... Position yourself in the north end of Windsor. Pick a direction, any direction. Start travelling in that direction. No matter which direction you choose, you will end up in the continental US. The geography of the United States has it surrounded.
Perhaps you are questioning why I am pretending to be engaged with your trolling? Mostly because I enjoy your sense of humour. Some of the stuff you come up with is downright hilarious. Well done!
No?
That's because it doesn't. No part of Canada is within the United States.
Situate yourself in one of those parts. Pick a direction, any direction. Start travelling in that direction. As you are geographically located inside that combination of states, you will eventually end up crossing into one of the aforementioned states. There is no heading you can choose that would avoid it.
Have you never looked at a map before?