Why does my phone (HTC One m7) say "Sim card from an unknown source and how can I fix it?

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AC Question

I recently purchased a factory unlocked HTC One m7 on eBay. The phone shipped from the US and I live in Canada. I am currently using a prepaid Koodo sim card, and when I put it in the phone a message appeared onscreen saying "Sim card from an unknown source". How can I fix this?
 

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