how can i turn up volume
how csi i turn up the volume on apple tv
iPhone 7 Plus, iOS 14
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What is your model Apple TV? Identify your Apple TV model - Apple Support
You can only use the volume controls on the side of the iPhone, when using the software Apple TV Remote in Control Center, if your receiver supports volume control over HDMI-CEC. This requires an Apple TV with CEC support (4th generation or later). Else you will have use a different remote for volume control.
Set up the Apple TV Remote on your iPhone, iPad, or iPod touch - Apple Support
Control your TV or receiver with your Siri Remote or Apple TV Remote - Apple Support