Hi there,
i don’t believe Elementor supports ( or is supported by ) the Offical AMP Plugin.
In this case you would have to Opt for Transitional or Reader and allow the AMP plugin to generate its own AMP Templates.
The AMP documentation and support is very good:
https://amp-wp.org/documentation/getting-started/template-modes/
There is the unofficial AMP for WP Plugin that does ‘say’ it supports Elementor:
https://wordpress.org/plugins/accelerated-mobile-pages/