I can't say anything for certain, as I don't own the game, just speak in very general terms.
It is rare to see publishers issue region locked keys for one service, and non-region locked keys for another. If they've got region-locking in place on their keys, they'll do it with pretty much all their keys (sold through digital distribution. Physical releases can follow slightly different rules).
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https://www.humblebundle.com/store/tom-clancys-rainbow-six-siege
Thank you
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