Privacy warning on Wi-Fi

Hi there.

I don't know your exact problem, could you explain it in more detail? If I understand correctly, your iPhone is warning you about the privacy of a Wifi network? If that's the case, here is how to turn on private Wifi address on your iPhone: https://support.apple.com/en-us/HT211227

If this is already on, the warning is just to let you know that this Wifi network could be possibly unsafe (doesn't mean that it is).