Find my phone button doesn’t work

Hi Llamapajamarama,

Thanks for reaching out to the community. Are both devices under the same Apple ID account and have an internet connection? This excerpt from Apple's article may provide why you are unable to locate your iPhone with your Apple Watch.

"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".

Find misplaced devices with Apple Watch - Apple Support

Have a nice day.