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I remember few discussions about tags compatibility. You might need to dig deep in Z2 Tablet forum. There was at least one thread but AFAIR it end up at XDA forum.
Do you get the "NFC Read Error. Try Again." message when you hold up the tag to the handset?
What happens if you hold the phone to another NFC capable device? Does it recognise any NFC at all?
I would repair the phone with PCC and check again
Bridge (for Mac)
Alternatives on How to backup Xperias
Here's how to run the repair on PC Companion:
And Bridge for Mac:
6 . Select your model of phone from the list that appears
You will want to start these processes with the phone powered off and disconnected from the PC.