I’d suggest you make a claim on your landlords insurance, they will likely ask the owners corporation for what is called a proof of no coverage under the strata schemes insurance. If the strata schemes insurance does not cover the loss of rent (as an example) then you claim through your insurer and you have a valid reason to seek your excess from the owners corporation. If it does however it forces the owners corporation to either raise a claim or if its less than their excess pay it from admin funds.
We have had a few instances where water damage to floating floors has initially been refused by the strata manager but when pressed by a lot owners insurer for a no coverage letter they quickly change their tune.
If you don’t have landlords insurance then a properly worded letter from your lawyer should also do the trick.