@Gtgjoey 

Since this is a specific device having trouble connecting to the Deco Wi-Fi network, please try the following troubleshooting steps:

1. Check Access Control: Go to the Deco APP > MORE > Access Control (Allow List or Block List), and check if your iPhone is mistakenly blocked.

2. Delete the device from offline client list: Go to the Deco APP > Client List (in the offline client list) > Find your iPhone (if it exists) > Delete it. This will remove its connection preference settings which might potentially be causing the issue.

3. Disable Fast Roaming: Go to the Deco APP > MORE > Advanced > Fast Roaming, and disable fast roaming.

4. Change encryption method: Go to the Deco APP > MORE > Wi-Fi settings, and change the main network encryption method to WPA2/WPA-PSK. Then try connecting your iPhone again.

5. Check for iPhone-specific warnings: Since iOS 14, Apple devices may show "Privacy Warning" or "Weak Security" messages. If you see these:
   • For "Weak Security": Ensure your Deco's security is set to WPA2 Personal (AES) or WPA2/WPA3 Transitional
   • For "Privacy Warning": Enable "Private Wi-Fi Address" in your iPhone's Wi-Fi settings for this network

6. Forget and rejoin the network: On your iPhone, go to Settings > Wi-Fi > tap the (i) icon next to your Deco network > Forget This Network. Then reconnect by entering the password fresh.

If the issue persists after trying these steps, please reply back to this post 

Thanks