How can I use a set of USB headphones to talk on my Note 8?

Not sure exactly about your phone, but generally...

Go to Settings -> Bluetooth -> More, tap the settings icon alongside your headset and then enable Phone audio.
 
I have them connected using the adapter but when I answer a call, it only goes through the phone.

yes I have the exact same problem and its a known issue that doesn't seem to have any priority of being fixed if they consider it a problem at all, one source states that its because of phone recording laws, I have not found an answer to this and find it quite unacceptable and highly inconvientant diminishing the value of the phone greatly....
 
Not sure exactly about your phone, but generally...

Go to Settings -> Bluetooth -> More, tap the settings icon alongside your headset and then enable Phone audio.
But he is using USB, not Bluetooth.
 

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