Cannot Enable ADB for Kindle Fire HD

Question

I'm trying to root an 8th generation Kindle HD Fire (Fire OS 6.3.0.1) I've turned on the Developer options, however, Enable ADB isn't listed under it. Is there another place I should look for the ADB setting?

I've done the following:

Settings > Security & Privacy >Turned on Apps from Unknown
Settings > Device Options > About Fire Tablet > Tapped Serial 7 times

Answer 1

Turn on "USB Debugging". That's what it's called in Developer Options.