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2015 Hyundai Elantra - Vibration

when driving speeding above 80 kmh there is vibration, i went to the garage they said it’s axle issue, they removed and put grease inside the axle, but still the same issue.
please give some advise

Note: axle is OK, wheel alignment is OK, brand new tires,

We are all wondering if the tires have been checked for balance and have been removed from the rims and rotated. Even new tires can have defects of problems.