Marantz sending 4:3 signal to my TV when using Nintendo Switch

MarrantzUser1000

Novice Member
When hooking the Nintendo Switch(NS) up to the Marantz AV7703 the AV7703 for some reason sends a 4:3 signal to my Sony XBR-75X900f 4K TV. I've hooked the NS directly to the TV and it displays fine in 16:9. Other devices I hooked up display in proper ratio as well (Blu-Ray Player, PS4, Raspberry Pie 4). I tried switching input HDMI ports on the AV7703 and no difference.

I'm guessing HDMI handshake, but i have no idea how to fix it.

Help appreciated.
 

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