I am looking for remote code for my LG sound bar NB3520A using a oneforall remote

The code for your LG soundbar is not in the memory of your oneforall remote and cannot be set up right away.

To resolve this you can do the following options:

Learning feature if you have the original LG remote or Upgrade the remote.

1) LEARNING PROCEDURE

Your One For All remote is capable of copying functions straight from the original remote control that came with your device. To use the Learning feature, please refer to the user manual.

2) UPGRADE

Please send the remote to the Customer Support Team for it to be updated. This service is free of charge (for both upgrade and postage back) within the first year of purchasing your One For All remote, provided you still have the proof of purchase.
If your remote has been purchased more than 1 year ago, or if you do not have the proof of purchase anymore, the upgrade service is still possible at the cost of £10.00 / €12.50. The code for your LG soundbar is not in the memory of your oneforall remote and cannot be set up right away. To resolve this you can do the following options: Learning feature if you have the original LG remote or Upgrade the remote. 1) LEARNING PROCEDURE Your One For All remote is capable of copying functions straight from the original remote control that came with your device. To use the Learning feature, please refer to the user manual. 2) UPGRADE Please send the remote to the Customer Support Team for it to be updated. This service is free of charge (for both upgrade and postage back) within the first year of purchasing your One For All remote, provided you still have the proof of purchase. If your remote has been purchased more than 1 year ago, or if you do not have the proof of purchase anymore, the upgrade service is still possible at the cost of £10.00 / €12.50.