There was some specific thing about which ID number, not ISBN as I recall, your book had to have to be part of the settlement. Some of my books qualify some don't.

Copyright office registration. If you or your publisher didn't do it, you don't qualify. Some publishers, even big ones, were exposed as neglecting this basic step when the Anthropic case was settled.

I would check the settlement db just to make sure: https://secure.anthropiccopyrightsettlement.com/lookup

You may entitled to a share assuming the publisher registered with the class action and there is a copyright registration in your name.