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No buttons on the new RX. everything is through the touch screen and some still in instrument cluster. Hidden in one of the least obvious sub menus probably.
Have you checked the dash switch that disables it?
where is it? checked the glovebox but no button...
On our 500h, the tailgate open/close button is on the dash, to the left of the steering column.
It requires a 'long press' to operate, presumably to avoid accidental operation.
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But, your issue is only when using the FOB?
What repair was made? Was it accident damage? If so, bring it back to the shop.
Perhaps something needs to be 'programmed'.