If you are on HF, @+username is the fastest way. Though I called her above.
If you’re sending an email… this is the only email address I can find, but I’m pretty sure it’s not…
legal@huggingface.co
You may also be able to use the email function on the forum, but this is a little harder to notice because you have to come to the forum to see that it has been received.
Discord is apparently the fastest way to do this if you are in a hurry.