Talked to Deus Medical, verified a box of DM Test P myself in this order:
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1. Manually entering code on deusmedical dot com
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2. Scanning QR code via deuscheck dot com
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3. Manually entering code via deusmedical dot com again
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In conclusion, I'm certain you simply entered the code incorrectly as this seems a common occurrence (confusing lowercase L and uppercase i or 5 and S etc.), feel free to mail the code to me and I'll verify this having happened or I can have Deus Medical verify this for you if necessary.