Thank you for using Apple Support Communities.
I understand that the Walkie-Talkie app appears to be missing from your Apple Watch. The place to start for this is the following support article:
Use Walkie-Talkie on your Apple Watch
The first part of the article covers setting it up and using it. This section provides information on troubleshooting:
Get help
If your iPhone isn't nearby, you can use Walkie-Talkie with a cellular or Wi-Fi connection. Learn how to use your Apple Watch when your iPhone isn't nearby.
For more help, find your issue below.
If you don't see the Walkie-Talkie app
- Download the FaceTime app on your iPhone. Open the App Store on your iPhone, search for FaceTime, then tap .
- Make sure that FaceTime is turned on. Open the Settings app, tap FaceTime, then turn on FaceTime.
- Open the FaceTime app. To make sure FaceTime is set up correctly, try making a call.
- Restart your Apple Watch.
- Restart your iPhone.
FaceTime is not available in all countries or regions.
If you're having issues with sending and receiving invitations
- On your iPhone, open the Settings app, then tap FaceTime. Make sure that you're signed in with your Apple ID. Under You Can Be Reached By FaceTime At, make sure that your email address is selected.
- Restart your Apple Watch.
- Restart your iPhone.
- Try to send the invitation again. On your Apple Watch, open the Walkie-Talkie app, swipe left on the contact, then tap . Tap , then choose the same contact.
If you still need help
If you updated to watchOS 5 and tried the steps above, but still need help, contact Apple Support.
Best regards.