Step 1 - Ensure your WIFI SSID and Password is entered correctly within your Profile:
Step 2 - When connecting an iOS device on the 'Home Screen,' you will be prompted with a pop-up letting you know a profile has been downloaded to your device (Image Below); now, you need to install this profile. For now, 'Close' this pop-up.
Step 3 - If you notice this popup on your device, head to the ‘Settings’ app on your iPhone. Then, tap on the ‘Profile Downloaded’ option.
Step 4 - Once you enter the 'Profile Downloaded' menu, you should see a WIFI profile waiting to be selected and installed. Select the WIFI profile and continue to install it. Once installed, WIFI should connect to your iOS device automatically.