I'm seeing people posting code numbers, and stating 'registered for me' ...
but they are not acknowledging others, who are saying, yes, the codes 'registered', but there is nothing in their 'My Offers' page of their account.
there are a number of hypotheses, in that, one 'can' register a code ...
but if that code does not show up on their 'my offers', is it REALLY registered ??
To the OP who ( earlier ) admitted ( sort of ) to using a 'script' to rattle off codes of 0000 - 9999 ...
Be aware of the well-established fact, that IHG Rewards have and DO actually audit and CANCEL accounts that are deemed to have breached the Rules ...
It happened to me ( with the dreaded 'survey' for 300 points in August 2012 )