Apple Watch does not appear in Find My app

You need to see these articles If Find My is offline or not working - Apple Support

Locate a device in Find Devices on iCloud.com - Apple Support

mayko240 Said:

"I can't find my device the find app does not find"

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Make Sure Find My is Set Up:

Do you see your device, when you visit this link?: https://www.icloud.com/find/. It may take a few days for it to show the exact location. Its location is based on an IP Address.