I see other bare patches forming so you may have grubs eating the roots. If you have a dog those could be pee spots so hose down the lawn where they go.

If you fill in the hole with dirt and keep it moist, the surrounding grass will grow and fill it in eventually.

I re seeded my lawn and that patch always dies out. Even after I did aeration and seeding as well. I have lawn company and they weren't able to revive it. They say a root may be causing it, but there were no trees ever planted there or nearby. I will try adding soil and seeding again

It's possible that there is an underground object of some sort, not necessarily a root, that is interfering with the grass root development. I would try digging down under that spot and see what's going on. It might help to replace the soil in the area with fresh topsoil.

Fill and re-seed that one spot and put a barrier around it so it does not get mowed until the grass tall and full. Seeding bare dirt is not easy.

What did they say about the other brown patches?

Ask your lawn company if they can get a patch of sod and fill it like a divot at a golf course. Find someone who is installing a sod lawn and beg for a leftover piece lol.

Plant a shrub.