HDMI audio share on Poly x50

[StCloudState]

New issue for rooms in use many years. 

Laptop connected to HDMI, Poly x50 HDMI in, shares video but not audio. Connecting same laptop to PC monitor with speakers plays audio. There used to be a setting for hdmi content sharing, audio enable, which seems to be what is happening. But I cannot find this setting anywhere. 

Need, A/V shared over HDMI to Poly x50 Zoom Room. Just updated Zoom and Poly software...