@lilbillyclinton,

When setting up the devices with an iPhone there are a few settings that could potentially cause problems with the setup process:

First, Check to make sure that your device is not connected to a VPN, this most often appears as a Key Symbol in your Notification Bar.

Second, With some devices, the use of private IP addresses can interfere with the communication between the devices. You can temporarily disable this setting in the Wi-Fi settings for your phone. 

Lastly, and most importantly, you should disable the mobile network connection on your phone. When connecting to the device, your phone may attempt to use your mobile data to communicate since the dimmer does not provide an internet connection.

Let me know if any of these settings are a fix for your issue.