Other than chill requirement, blueberries are primarily pollinated by bees - the pollen is quite sticky and therefore not easy for wind to move it around, so although they are self pollinating, the bee/insect intermediary is essential, see here https://entomology.ces.ncsu.edu/small-fruit-insect-biology-management/blueberry-pollinators/
Blueberries are self-pollinating, but a big part of self-pollination is environmental. This is a good article describing conditions affecting self-pollination and being indoors without wind and pollinating insects would very likely reduce the chance of pollination.
Specifically about your blueberry:
According to this resource what you might be missing is the "chill hours" below 45º F which is really a likely difference between indoors and outdoors. Also the lighting indoors is not likely the same as the comment mentions.
Find your thrill with blueberry chill!
And more generally:
Plants can be sensitive to ...