5G SA and VoNR support for Xperia 1 viii

Just wondering if anyone has used the Xperia 1 viii on a 5G SA network with VoNR.

Asking this question because all cellular networks globally need to certify devices that can use the 5G SA and VoNR (voice over 5G) service. The more common devices such as the Samsung and iPhones get certified but I'm not sure Sony actively engages with network operators to get this done.

If the device is not certified, it will not work with 5G SA networks and will not support VoNR. There are already a lot of networks on 5G SA, with time the 4G LTE spectrum and the 5G NSA service will ramp down. A high end device not getting certification will result it in becoming obsolete sooner than later (or be restricted to a poorer user experience on legacy technology).

Could not find any information in this regard for the Xperia 1 viii. Contacted Sony support but no useful response.