Why does syncing through wifi never work?
Because money.
iPhone SE, iOS 16
Question marked as
Has nothing to do with money. After you set up syncing with iTunes using USB, you can set up iTunes to sync to your device with Wi-Fi instead of USB. For more info, see the 'Sync your content using Wi-Fi' and 'Get help' sections in:
Use iTunes to sync your iPhone, iPad, or iPod with your computer - Apple Support