I think the Halo reader has a problem with zero’s.
Using the RFID tag emulator (Hack ID from 360 unicorn team), I’m emulating your UID number and indeed, the Halo reader doesn’t respond.
Then I changed the UID number to 8EBC911125 and the Halo reader found the emulated RFID tag right away and shows the UID number in it’s display.
Vicarious