If you are doing something genuinely new, you can waste a lot of time tooling about trying to find someone with authority to say “Yes”.
Frankly, if whatever-it-is is that new, no-one will know if they have the authority or not.
So, unless you’re asking the very top guy for permission, you’re far better off assuming you have the authority yourself.
Then, at least, you have the chance of asking for forgiveness.
Instead of begging for mercy at review time because you’ve failed to do anything at all.