How to clear phone configuration

US account

During our demo, some changes were made to my local Polycom phone that resulted in the phone being unable to be registered. In the interest of time, I wanted to factory reset the phone and associate it with RingCentral. The error I'm experiencing is Line Not Registered. No network or firewall changes have been made that would have interrupted communications with the RC network.

I've factory reset the phone and reentered provisioning information, but the problem persists.

I've removed the phone from the RingCentral site, factory reset the phone, and readded the phone to my extension. The problem persists.

I feel as if the incorrect configuration information in my phone is being saved up to RingCentral. Can anyone confirm if this theory is valid?

Any recommendations on how I can get my device back online and registered?

Thanks,
Elvis