Change the name of the room to something else (TV Room, Sitting room...) or change the name of the bulb which I will for the sake of argument ASSUME you have the bulb and the room named the same thing... which is a no-no in the Alexa systems... If the room and the bulb share the same name it usually gives you a "multiple devices share the same name" message and does nothing... but I have had a time or two I had to work out similar issues due to this with no indicators at all.
Name the Light you're trying to turn on/off something like "Corner light" and the room name stays the same as it is... if that is the issue, this should cure the problem. Once the room and the bulb have different names, you can use both to turn that light on/off if you only have the one bulb in that room.