What error messages are you receiving during the setup process?
What is the Make & Model of your Router / Wireless Access Point?
What is the Make & Model of the App Device you are using to run setup?
What is the current Firmware & Config Version installed on your Ironwood 885 Smoker?
Depending on the above answers, there can be a lot of variables preventing the successful setup of the WiFIRE Controller on your Home Wi-Fi Network ... most of them can be overcome with some minor modifications to your Router / Wireless Access Point & App Device ...
I have a few posts on the subject of needing to separate the 2.4GHz & 5GHz frequencies, by applying a different Network Name (SSID) to one of them ... there is also a WORKAROUND for putting the App Device into Airplane Mode that can be useful ... lastly, if you are using a Network Extender, how that is configured will need to be looked into as well (is it 2.4GHz only, are you extending the same SSID or creating a new one, etc.) ...
Reach out if you want to delve into the nuances in more detail ...