I managed to do it. With Apple devices the procedure is the following. You need 2 devices at least one device with GPS. I did it with 2 iPhones, but iPhone and a computer will also do.
On the phone open the "Find My" app. It's showing the old location. Click on the profile icon ("Me"), Location and edit. Select "none". Close the "Find My" app.
Switch off the WiFi completely from the settings app, Wi-Fi. Just the disconnect from the Control Center is not enough.
Open again the "Find My" app. It should show the new location based on the GPS coordinates. If it doesn't, go outside for better reception. If it still doesn't work click on the current location arrow icon. You should see your phone located correctly.
Once the device is correctly located, from the second device start the "Find My" app and play the sound on the first device.
Dismiss the localisation sound on the first device and turn on the WiFi. The device should remain correcly localised at the new address.
That's it. Within 24 hours, all devices should acquire the new address when connected to the WiFi. If you don't have patience, you can repeat this procedure on every Apple device.
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