Universal remote works, doesn’t work with soundbar

[WHAT]

So I like my Samsung TV and Samsung soundbar but the universal remote only works half the time to control the volume of the soundbar. Some inputs or apps don’t let me use the remote for soundbar volume control, others do. Why?

[xSteveuk]

Hi,
This page may be helpful

Control your soundbar using your Samsung TV remote

https://www.samsung.com/us/support/answer/ANS00049279/