I have tried moving obstructions but the trees still don't growThis mostly happens when there are some other blocks near the sapling which prevents it from growing. if there are any blocks, grass, flowers, etc around the sapling, remove it and look if the tree grows. Placing saplings next to each other shouldn't be an issue, so you don't need to remove saplings if you have them close to each other.
I have also noticed that acacia trees don't grow when there is water near the saplings. Could this be the problem?I have tried moving obstructions but the trees still don't grow