samething about my order ...not supported?

for my phone wich service need to use? or not supported?

[555455] AT&T USA All iPhone Not Eligible/ Not Found In AT&T/ Active On AT&T Account
IMEI : 3532570776xxxx51
Code : Unlock Failed Under This Service - Denied (Service Agreement)
Submited On : 2018/06/06 14:43:43
Replied on : 2018/06/09 15:49:50

thx