sm -g950u tmobile unlock failed

Welcome to Octoplus Box Samsung software version 2.6.7
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To connect GT-I9023 phone you have to perform the following steps:
1. Disconnect USB cable from phone.
2. Go to Menu->Settings->Applications->Development.
3. Turn on "USB Debugging" option.
4. When the message appears press "Yes".
5. Connect USB cable to the phone.
6. Press "Read Info" in software.
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Connecting to server...
Username: naseer
Authorizing...
Checking balance...
Your balance: 150 credits.
Performed by 2.6.7 Software version.
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Platform: Samsung Android
Selected port: COM11
Selected model: SM-G950U
Operation: Unlock
Detected phone model: SM-G950U
Firmware compiled date: Mon Feb 26 17:45:12 KST 2018
PDA version: G950USQU2CRB9
CSC version: G950UOYN2CRB9
SW version: G950USQU2CRB9
Phone SN: R28J40FE5DT
Android version: 8.0.0 (R16NW)
Sales code: TMB
Country: USA
HW platform: msm8998
HW Chip: MSM8998
HW Modem: MSM8998
Security patch level: 2018-02-01
SIM 1 status: network locked
Codename: dreamqltesq
Connecting to modem port...
Found phone on COM389
Reading IMEI...OK
Searching for USB diagnostic port...
Reading info...
Phone was not found on the selected port!
No diagnostic ports found!
Type *#0808# and select "DM+ACM+ADB"!
Phone unlocking failed
Performed by 2.6.7 Software version.
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Platform: Samsung Android
Selected port: COM389
Selected model: SM-G950U
Operation: Unlock
Detected phone model: SM-G950U
Firmware compiled date: Mon Feb 26 17:45:12 KST 2018
PDA version: G950USQU2CRB9
CSC version: G950UOYN2CRB9
SW version: G950USQU2CRB9
Phone SN: R28J40FE5DT
Android version: 8.0.0 (R16NW)
Sales code: TMB
Country: USA
HW platform: msm8998
HW Chip: MSM8998
HW Modem: MSM8998
Security patch level: 2018-02-01
SIM 1 status: network locked
Codename: dreamqltesq
Connecting to modem port...
Found phone on COM389
Reading IMEI...OK
Searching for USB diagnostic port...
Reading info...
Mode: Normal
Firmware compiled date: Jan 11 2018
Firmware compiled time: 18:00:00
Firmware released date: Feb 23 2018
Firmware released time: 14:04:38
SW Version: MPSS.AT.2.0.c5-00599-8998_GEN_PACK-1
Initializing exploit...
Error (1)
Phone unlocking failed
Performed by 2.6.7 Software version.