The brake lights are not working. The taillights and blinkers work. The relay trigger is working, or at least showing voltage.
I don't have the wiring diagram for this vehicle handy, but one thing to check is the brake light switch. Hyundai actually issues a recall on these switches. I suggest you call the dealer with the VIN of your vehicle to see if it qualifies. If not, the team at YourMechanic would have happy to fix your brake lights for you.
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