Help needed to identify access-card

you PM3 looks like it is working correctly, it may be the placement if your card,
Try your searches again, giving it some seperation put a (non conductive) spacer between card and PM3 antenna.

Alternatively, try scanning with TagInfo and see if you get a result.

Do you have any info on the readers?

Make?
model?
Photos?

Any writing on the card?