Does the JB match the spaces for the serial number input? I would guess it is, although I have never seen a serial number called out as a "JB". I am sure you checked on this, but make sure the characters are not case sensitive.
If its a new PC with support still, call them up if the Corel copy is OEM and ask them what the deal is. If its older you might be SOL as they wont support it anymore. If its from corel I would call their support line and just ask, saves a ton of headache messing around with it.
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