The Glue for Yoast SEO & AMP plugin is what adds all the Yoast meta-y goodness to the AMP versions created by the AMP plugin.

This plugin is a must if you’re using the WordPress AMP plugin. It’s an easy install, and Yoast even goes above and beyond by adding some custom styling options for the AMP pages into the plugin as well.

AMP Yoast Glue Design Settings