I can confirm a but that I’ve found. I use dual band wifi (both 2.4 and 5 GHz). My iPhone will prefer 5 GHz and the spark core can only do 2.4 GHz. If you try and use the app it will never send the wifi credentials over to the spark because the phone will try and communicate with it over 5 GHz. I had to disable 5 GHz for my wifi network to get it to connect.
Thanks for the information! This is a known issue with CC3000 and I believe the docs mentioned to use only a 2.4Ghz Wifi router. 
I have a router which supports both bands. The trick is to run each band with a different SSID. The 2.4G band has a SSID similar like ‘JoesWifi’ and the 5G band has SSID ‘JoesWifi+’
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I have three (Argon) devices that worked fine in the office, but at a customer location they’re getting IP addresses and can get to the Internet, but can’t make a cloud connection. Could this be due to their networks having both 2.4 GHz and 5 GHz networks with the same SSID?
I would open a new topic for this since this original discussion was 6 years ago and had to do with Particles first device.
With that being said, it sounds like you may have a port issue, not a wifi issue.
I’ve submitted a support ticket and will wait to hear from them. If it’s not successful, then I’ll start a new topic as you suggested. The customer is claiming there’s nothing stopping the devices from connecting to any cloud service…as long as it isn’t in a foreign country. I’ve talked to them repeatedly about blocked ports, but they’re claiming that’s not the case. Thanks!