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Yesterday I applied for an American Express Gold card and received the same message and got the approval email 15 minutes later.
I applied for the AMEX True Earnings Costco card recently through their website, got a "we'll figure it out" message and checked a few days later on my status. They had no record of an application, so I figured I'd done something wrong. I then re-apped with the mailed offer code I'd happened to have gotten (I sat down, applied, then opened the mail to find it). I ultimately got approved and declined - the decline was due to the duplicate application. It was weird. I have my card now, so it didn't prevent me from getting approved at all.
That was strange. Just got another email that they've reached their decision and to check the app status page and now it's at canceled again. Interesting.