I am on a 30 day trial for OnDemand as I wait for my open source license to activate. When I connected our GitHub account, I generated the oAuth tokens, I went to GitHub, and hit Authorize. I was redirected to the homepage, as expected, because the guide says to set the root JIRA URL as the callback. When I went to the DVCS page, the account was not listed. This was repeated three times, to no avail.
I have just tested with my On Demand account and is able to connect, perhaps I will try walk you through the steps for connecting with your GitHub account (Note: you need to be administrator of the account in order for it to work)
Hope this helps and let me know if you have any problem following the instructions :)
This is actually captured on the following documentation if you want to refer:
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