Welcome to the RingCentral Community

For other users who have same issue, this is feature to reject call that ringing in other devices when calling mode in this widget is not Browser.

To test it:

1. Set calling mode into Call with RingCentral Phone in Calling setting page

2. Login your sandbox account at RingCentral Phone desktop app https://developers.ringcentral.com/guide/basics/your-rc-phone
3. Use other phone to call your sandbox number

4. Reject it at the widget, the ringing call should be showed at "Ongoing calls on my other devices"

5. To pass the graduation requests, you need to reject 5 times in 48 hours

OK, thank you very much for your help

You app is graduated.

If you don't need that endpoint, remove it from your code.