No, you cannot plug your NEMA 14-50 adapter directly into this cable.
This is a Tesla charging extension cable with NACS connectors on both ends—it is designed to extend your Tesla Mobile Connector / Wall Connector, not to plug directly into a wall outlet or NEMA adapter.
The correct setup is:
NEMA 14-50 outlet → Your Tesla charger (with 14-50 adapter) → This VEVOR extension cable → Your Tesla car.
It will work perfectly to extend the reach from the charger to your car.
By vevor