iPhone will not auto login to known WiFi networks

Some routers use MAC address filtering or “Private Wi-Fi Addresses” might confuse them.

To resolve this, you should contact the service provider or the agent who installed your router. They can help you check the router’s settings and confirm whether your iPhone’s MAC address is listed correctly. You may need to provide them with your iPhone’s current MAC address, which you can find by going to Settings > Wi-Fi, tapping the “i” icon next to your connected network, and looking for the “Wi-Fi Address.”

If you have Private Wi-Fi Address enabled, inform the agency not to incorporate the device MAC address. Instead, they should use the Private Wi-Fi MAC address for filtering.

Private WiFi Address (MAC Address) has three Options:

• Off: Disables the use of a private Wi-Fi address. Your device will use its default (permanent) MAC address when connecting to Wi-Fi networks.
• Fixed: Your device uses one consistent private MAC address for a particular Wi-Fi network. Once your device generates this private MAC address, it will reuse the same one for that network every time you connect.
• Rotating: Your device frequently changes its private MAC address when connecting to the same Wi-Fi network, providing the highest level of privacy. This makes it nearly impossible for the network or observers to track your device over time.

Is this a problem with one Wi-Fi network, or all Wi-Fi networks?

If it is just one try restarting your router.

Beyond that, are you logged in to your Apple ID/iCloud ID? That’s where the Wi-Fi passwords are saved.

You can also try a networking reset:

• Open Settings
  • Tap General
  • Tap Transfer or Reset Phone
  • Tap  Reset
  • Tap Reset Network Settings

• • This will erase all Wi-Fi passwords, but will not result in any other data loss.