The jack is where Cat 6A gets lost

A schedule arrives written for Cat 6A: cable, panels, jacks, cords. Somewhere between the quote and the order, the jacks become Cat 6, because they are cheaper and look the same and the cable is what everyone thinks of as the specification. The cable goes in, the jacks go on, and at handover the certifier reports a Cat 6 channel.

That is not the tester being difficult. ANSI/TIA-568.2-D rates a channel by its lowest rated component, and the jack is a component. A Cat 6A link has to hold its performance to 500 MHz and control alien crosstalk between neighbouring cables, and a Cat 6 jack was never designed to do either. The cable alone cannot carry the rating past it.

The same substitution happens with patch cords, and it happens with the panel. Where a warranty is wanted, the whole channel comes from one manufacturer's system, because that is the only channel the manufacturer will warrant.

The practical check before ordering is short: every line on the schedule that touches the signal, cable, jack, panel, cord, carries the same category. If one of them does not, the job is the lower category, and it is better to know that at the quote than at the report.