Yealink T43u not provisioning "no service" after multiple attempts

hi dselden63,

begin by adding your phone to the Zoom web portal. 

Note: Make sure to add your phone to the Zoom web portal before powering on a new phone for the first time or performing a factory reset on a previously-used phone. You can find your phone's model name and MAC address on the label located on the bottom or back of the phone.

Getting started with provisioning desk phones – Zoom Support

here are the directions for yealink factory reset

Resetting to factory default (Yealink) – Zoom Support

here are yealink troubleshooting directions

Yealink troubleshooting guide – Zoom Support

thanks,  eliot