Spent hours trying to find the code myself -- 4029 should do the trick!
Here's a tutorial in case you need it, I've slightly re-written the instructions to help you.
01.) Power on the device to be programmed (Sony HT-CT100 Sound Bar).
02.) Point the remote control at the selected device.
03.) Press and hold the AUX key along with the OK key. Hold both keys for one second, then release. The four mode keys (AT&T, TV, DVD, AUX) on the remote control flash twice to indicate you are in search mode.
04.) Enter the 4-digit device code (4029) using the keypad on the remote.
05.) The appropriate mode key (AUX) will give a long flash indicating it received the code.
06.) Point the remote control at the selected device and press the POWER key to turn off the device and confirm programming.
Try 2338...worked for me
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1004 worked for me.
use magnavox code 1053
AUX + 2 + 833 + # and soundbar should work
Try 11381
try code 1071. It worked for a sharp aquos 60" tv.
Waths the remote code for pixel
what is security code for sony xav -60
According to the AT&T website, these are the codes. They didn't work for me, but maybe you'll have better luck: 1002, 1109, 1137, 1201, 1202, 1249, 1272, 1275, 1276, 1277, 1278, 1317, 1356, 1384, 1388