N910A needs root just to unlock? Otherwise Unlock failing

Any advice? N910A with firmware N910AUCU2DOI2 unlock failing. Other N910A and N910T didn’t need root to unlock. Any suggestions?

To connect SM-N910A phone you have to perform the following
1. Disconnect USB cable from phone.
2. Go to Menu->Settings->More->About Device.
3.Tap on "Build number" 7 times to enable developer options.
4. Go to Menu->Settings->More->Developer options.
5. Turn on "USB Debugging" option.
6. Go to dial window.
7. Enter "*#0808#" number.
8. Select "DM+Modem+ADB".
9. Press Home button.
10. Restart phone.
11. Press "Read Info" in software.
Platform: Samsung Android
Selected port: COM3
Selected model: SM-N910A
Reading info…
Mode: Normal
Firmware compiled date: Aug 12 2015
Firmware compiled time: 12:00:00
Firmware released date: Sep 3 2015
Firmware released time: 10:58:23
SW Version: MPSS.DI.3.0.c5-00429-M9625TAARANSZM-
Detected phone model: SM-N910A
Firmware compiled date: Thu Sep 3 20:19:26 KST 2015
PDA version: N910AUCU2DOI2
CSC version: N910AATT2DOI2
SW version: N910AUCU2DOI2
Phone SN: R38G306RCLA
Android version: 5.1.1 (LMY47X)
Checking Root:
Phone is not Rooted.
Unlocking phone…
Phone will restart now. Please don’t disconnect cable!
Phone unlocking failed