Samsung G950U AT&T network, I tried to unlock but always calculation error ( 0 )

I have credits and tried to unlock but got error callculation

Phone is on android 8.0.

Waiting ADB device... OK
Reading phone info...
Model: SM-G950U
Android version: 8.0.0
PDA version: G950USQS5CRH1
CSC version: G950UOYN5CRH1
Phone version: G950USQS5CRH1
Product code: SM-G950UZSAATT
CSC country code: USA
CSC sales code: ATT
Phone SN: R38J40CXXXX
IMEI: 35772308089XXXX
HW version: REV1.0
RF cal date: 2017.04.13
Chip name: MSM8998
Modem board: MSM8998
Security patch: 2018-08-01
Boot Warranty bit: 0
Waiting for device to become ready... OK
Initialization zTool... OK
Running zTool, please wait...
Start... OK
Initialization... OK
Generate and check client proof... OK
Verify proof by client... OK
Reading data from phone... OK
Searching Ramdump interface... COM74 detected
Reading data from phone... OK
Calculating... error (0)
Done with Samsung Tool PRO v.33.8