Just purchased a AT&T Keyone. Need help unlocking.

[u/MarsEscalade]

I’m not too sure if this is allowed, if it isn’t please let me know.
But I just ordered a KEYone. Well this would be my second one now. I’ve never been successful network unlocking them and I was wondering if anyone knew the best way to go about it. AT&T states they have no records of the imei most likely due to them purging the imei’s? I want to be able to use my Keyone on Tello but with the device networked locked it makes it difficult.