Home Theater Questions? Ask a Technician for Answers ASAP
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Sorry to hear you’re having trouble.
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This is, almost always, a hdmi hdcp hardware handshake issue, and is extremely common.
Sadly, the hdmi/arc connection is not the universal language it was hoped to be, especially between multiple different devices.
As an initial step, make sure the firmware on the yamaha is up to date. If it is, then this comes down to an internal fault or a communications issue.
Your best option is to bypass the yamaha. It has 4k passthrough, but doesn't do any scaling, so it is really not adding any value here in terms of video.
Connect all your devices directly to the tv, via hdmi, then run a separate optical cable from the tv back to the yamaha for audio.