Numerous people have 2+ Discover cards. You should talk to their CS, explaining that you know people have more than 1 card, so the policy is obviously wrong, blah blah blah.
I believe you have to have the account open for a certain time frame before they will grant a 2nd account.
Yes, they told me the minimum was 1 year.
i just chatted with a Discover Rep and was told as long as my other Discover account was open for more than 12 months then I could apply for the IT card and if approved have two cards issued by Discover.
I am just waiting for UTL to be at the coveted less the 1.5% before I apply.