Not all boards have it, you can try to attach the debug card instead into the TPM header or a PCI slot, usually only one PCI slot works, if at all. The pinout should be generally the same on any board, so u can try to find some boardview to check it.
The port itself is there, but the port has 11 pins and not 13 like on other debug ports, also the missing pin is pin 7 which is important in a lot of the pinouts
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