Find my iphone not working on Apple watch 6

Hey there samvit80,

When you say it doesn’t work, what exactly do you mean? Is the app not opening or is it not finding your iPhone? The steps to help may vary depending on the issue. In the meantime, make sure you’re following these steps to locate your missing iPhone with your Apple Watch:

See the location of a device

If your device is online, you can see its location in the Find Devices app. For supported devices, Find Devices can locate the device even if it’s powered off, in Low Power Mode, or if airplane mode is turned on.

Open the Find Devices app  on your Apple Watch, then tap a device.

* If the device can be located: It appears on the map so you can see where it is. The device’s approximate distance, time it last connected to Wi-Fi or cellular, and charge level appears above the map. An approximate location appears below the map.

* If the device can’t be located: You see “No location” under the device’s name. Under Notifications, turn on Notify When Found. You receive a notification once it’s located.

Play a sound on your iPhone, iPad, iPod touch, Mac, or Apple Watch

1. Open the Find Devices app  on your Apple Watch, then tap a device.

2. Tap Play Sound.

* If the device is online: A sound starts after a short delay and gradually increases in volume, then plays for about two minutes. The device vibrates (if applicable). A Find My [device] alert appears on the device’s screen.

* A confirmation email is also sent to your Apple ID email address.

* If the device is offline: You see Sound Pending. The sound plays the next time the device connects to a Wi-Fi or cellular network.

Read more here:

Find misplaced devices with Apple Watch

You can also use Find Devices on iCloud.com as well to locate your iPhone. Read how to do this here:

Locate a device in Find Devices on iCloud.com

Take care.