Yealink T48S Phones Failing to Provision/Reprovision with Zoom Phone

We are experiencing an issue with Yealink T48S phones where the devices will not reprovision with Zoom Phone after being removed from an existing user and reassigned to another user. The phones work normally until we attempt to reprovision them, at which point they are unable to successfully provision back to Zoom.  We are only having this issue with Yealink T48S phones, other phones are able to provision without issue.  
 

We have been able to reproduce the issue on multiple T48S phones. Some of the troubleshooting we have completed includes:

• Factory resetting the phones and attempting a clean provision

• Removing and re-adding the devices in Zoom

• Removing the devices from Yealink RPS/YMCS

• Downgrading and upgrading firmware versions as recommended by Yealink

• Confirming network communication with both Yealink and Zoom

• Testing on a network with direct internet access to rule out our corporate network/firewall

• Collecting packet captures and diagnostic logs for both Zoom and Yealink support

The issue persists through all of the above testing. We are currently working with both Zoom and Yealink support but wanted to see if anyone else has experienced similar behavior with the T48S, particularly when reprovisioning or reassigning an existing phone.

Has anyone else run into this specifically with the T48S? If you have, I’d be interested to know what you found and whether you were able to get the phones provisioning again.