Volume Key not working on Lock Screen

[HLBB]

Hi Everyone,

Just got my S9+ and it seems to have a lot of problems around the Lock Screen (including not waking up for new notifications). 

Another thing that's a real problem is that I can't control the volume while on Lock Screen. Wheter the screen is off or whether I wake up the screen, pressing the volume keys up or down has no effect. 

How can we fix this bug? 

Thanks! 

[KevenAyoub]

I used the app Sideactions from the play store to change the button behavior in the lock screen. 

https://play.google.com/store/apps/details?id=com.jamworks.sidekeybuttonremap&hl=en_CA

[Angel5941]

Hi, I just noticed that I have "separate app sound" on, try turn it off that works form me.