Ethernet option grayed out (Galaxy Note 8)

I need a wired internet connection to my Samsung Galaxy Note 8. Settings>More connection settings>Ethernet is grayed out. 

I have confirmed that my USB-c cable can transfer data to & from my PC (Dell). 

I have tried turning off mobile & wifi data.

I updated my operating system, enabled developer mode/debugging and every other suggestion I could find.

I could use an ethernet + adapter directly from the router, but prefer to connect to nearby PC with wired internet.

Thanks for any help!