Ye it’s there. Here’s the list of items in karaf:
openhab> smarthome:items list
yamahareceiver_yamahaAV_5f9ec1b3_ed59_1900_4530_00a0de9fb104_input (Type=StringItem, State=NULL, Label=null, Category=null)
yamahareceiver_yamahaAV_5f9ec1b3_ed59_1900_4530_00a0de9fb104_power (Type=SwitchItem, State=NULL, Label=Power, Category=switch)
network_device_192_168_10_46_online (Type=SwitchItem, State=ON, Label=Online, Category=null)
yamahareceiver_yamahaAV_5f9ec1b3_ed59_1900_4530_00a0de9fb104_volume (Type=DimmerItem, State=NULL, Label=Volume, Category=SoundVolume)
yamahareceiver_yamahaAV_5f9ec1b3_ed59_1900_4530_00a0de9fb104_surroundProgram (Type=StringItem, State=NULL, Label=Surround program, Category=null)
yamahareceiver_yamahaAV_5f9ec1b3_ed59_1900_4530_00a0de9fb104_mute (Type=SwitchItem, State=NULL, Label=Mute, Category=SoundVolume)
Sonos_Livingroom_Control (Type=PlayerItem, State=UNDEF, Label=Sonos_Control_LivingRoom, Category=Player)
SONOS_LIVINGROOM (Type=StringItem, State=NULL, Label=Sonos Wohnzimmer, Category=null)
SAMSUNGTV (Type=StringItem, State=NULL, Label=Samsung TV, Category=null)
LG_COMBO (Type=StringItem, State=NULL, Label=LG VHS/DVD Copy Dock, Category=null)
SONY_ALL (Type=StringItem, State=NULL, Label=Sony All System, Category=null)
POPCORN (Type=StringItem, State=NULL, Label=Popcorn Hour, Category=null)
MED500X (Type=StringItem, State=NULL, Label=Med8er 500X 3D, Category=null)
BDP_S4200 (Type=StringItem, State=NULL, Label=Sony Bluray BDP-S4200, Category=null)
ZAPPITI_IR (Type=StringItem, State=NULL, Label=Zappiti Mini (Infrared), Category=null)
HORIZON (Type=StringItem, State=NULL, Label=Zappiti Mini (Infrared), Category=null)
YAMAHA_RXV675 (Type=StringItem, State=NULL, Label=Yamaha RX-V675, Category=null)
ITACH_SENSOR3 (Type=StringItem, State=NULL, Label=iTach Sensor 3, Category=null)
ZAPPITI (Type=StringItem, State=NULL, Label=Zappiti Mini, Category=null)
HORIZON_POWER (Type=StringItem, State=NULL, Label=Horizon Power On Sensor, Category=null)
AIRCONTROL (Type=GroupItem, Members=0, State=NULL, Label=null, Category=null)
AIRCONTROL_SWITCH (Type=StringItem, State=NULL, Label=Lüftung, Category=null)
AIRCONTROL_STATE (Type=StringItem, State=NULL, Label=Lüftung, Category=null)
AIRCONTROL_MODE (Type=StringItem, State=NULL, Label=Lüftungsmodus, Category=null)
AIRCONTROL_TEMP_OUTDOOR (Type=NumberItem, State=NULL, Label=Aussentemperatur, Category=null)
AIRCONTROL_TEMP_INDOOR (Type=NumberItem, State=NULL, Label=Innentemperatur, Category=null)
UPDATE: After Rebooting the system it recognized the item all of a sudden. The only other error was that I had to enclose the Commands in double quotes