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I have an HTC One ( the first one ) and this app is listed as incompatible. How do I find out why?

It's probably because you're running an old version of android. I don't know that you are but that is a likely reason.

Perhaps because I am in Canada. I would have thought it would have said that rather than "incompatible".

It does say "not available in your country". Robinhood is only available in the US for now.