I've got an early T6 (Euro 5) and use one of the latest VCDS OBDII connectors and it fits OK. I've also used the same VCDS connection on a nearly new Golf GTD and a Golf GTE plus various older VWs and all have fitted correctly.
As far as I can see there is only one OBDII (or OBD2 it's not 11) BUT it may support different protocols dependent on the age of the vehicle. See OBD2 Explained - A Simple Intro [2021 | The #1 Tutorial]
It sounds as if the common denominator with your problem is the OBDII connection on your test gear.
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