Welcome to the RingCentral Community

Thanks Phong, the issue was the test phone was not created in the sandbox environment. I appreciate your help!

This event would tell the system to send telephony events of any phone or phone number under your account.

"/restapi/v1.0/account/~/telephony/sessions"

This event would tell the system to send presence and simple telephony status event of the extension that subscribed for the event.

"/restapi/v1.0/account/~/extension/~/presence?detailedTelephonyState=true"

You test phone or number must be under the account. Double check if you accidentally test your app in sandbox but using your production number or the other way around.