That's planning ahead.
Reckel, if it is all working ignore the following
To get the UHD discs working and HDR for the games the entire chain of connections needs to be Hdmi 2.0/Hccp 2.2.
If this is the case, then the Yamaha needs to be in, as stated Mode 1, for the correct frequency and bit depth. This can be done by the front panel button combo or the much easier web interface 192.1.168.???/Setup, it is in the Advanced section. The "/setup" lets you change anything in the Yamaha, without that part you can pick zones, volume and surround mode. The Tv needs to be enabled for Deepcolour or whatever the equivalent setting is on the HDMI input. Then run the check hdmi on the Xbox One S. You should get ticks across the board.
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