It appears to be indoors.
Trees and plants in general need the environment they evolved in, or something very close. Humans developed the ability to migrate from place to place but plants are rooted where they evolved and need sunlight - lots of it. They learned long ago to take energy from sunlight and use it. Without sunlight they get weaker and weaker, and eventually die from starvation.
Similar statements can be made about air motion, humidity, temperature variations, and more.
It really needs to be outdoors in sunlight all day.