How do you know thst the awning is strata property?
If it was there when the building was built it’s common property.
But it could have been added some time later.
Then comes the question of what water leakage there is. Since outdoor areas are not habitable areas, the threshold for water leakage causing nuisance is pretty high.
I think this is one of those cases where you could have a standoff. A negotiated result with your OC is possibly the expedient solution.