Find My Not Updating Location In Real Time, Why?

To use Find My and Location Services on an iPhone effectively, both your iPhone and the device you're trying to locate must have an active internet connection. These services rely on internet access to share your location with friends and family and to track the locations of devices, people, and items. Without internet connectivity on either end, the sharing and locating features of Find My and Location Services will not function properly. --> Internet not available WiFi and Cellular … - Apple Community

Connecting to Wi-Fi doesn't necessarily mean you're connected to the internet.  --> Internet not available, WiFi and Cellular … - Apple Community

On iOS devices, you may sometimes see that you're connected to a Wi-Fi network, yet experience no actual internet access. This can be confusing, especially when both Wi-Fi and cellular signals are showing, but nothing loads.

Here’s what’s happening:

1. Wi-Fi without internet: Your iPhone or iPad may connect to a Wi-Fi network (like a router or hotspot), but if that network doesn’t have a working internet connection — due to ISP issues, router problems, or restricted access — you won’t be able to browse or use online services.
2. "No Internet Connection" warning: iOS tries to detect this. If it finds that the Wi-Fi you're connected to has no access to the internet, you'll see a message like “No Internet Connection” under the Wi-Fi name in Settings.
3. Why iOS doesn't always switch to cellular: If you’re also on a mobile data plan, your iPhone should switch to cellular if the Wi-Fi is unresponsive. However, iOS doesn’t always do this automatically. There are two features that affect this:
   1. Wi-Fi Assist (Settings > Cellular > Wi-Fi Assist): This allows cellular data to take over when Wi-Fi is weak, but it may not trigger if the Wi-Fi is technically “connected” but just not working.
   2. Low Data Mode or VPNs can prevent automatic switching.
4. Troubleshooting tip: If you’re connected to Wi-Fi and suspect a lack of internet, try:
   1. Opening Safari and visiting a reliable website (e.g., apple.com).
   2. Turning Wi-Fi off and back on.
   3. Forgetting the network and reconnecting.
   4. Switching to cellular manually if it’s available and working.

I agree with you, my wife's phone will not update her location for days for no reason. We are on the same WiFi sitting in the same room. We both have active internet and a good cell signal. Mine updates and hers does not.