Your deviceToshiba Z870 Mini LED
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What to do now
Find the ARC or eARC socket
Look at the HDMI sockets on the back of the television and find the one marked ARC or eARC.
Manufacturer UI recreationToshiba Z870 Mini LED · Toshiba Fire TV

Toshiba Z870 Mini LEDToshiba Fire TV · 14:32
Settings
NotificationsNetworkDisplay & SoundsApplicationsEquipment ControlControllersAccessibilityMy Fire TV
Back of the TV
HDMI 1
HDMI (ARC)
Optical audio