Jetpack Infinite Scroll doesn't work :-(

Hi guys

I have a static front page that shows the first 20 posts, I am trying to enable the Jetpack Infinite Scroll plugin. I’ve activated it from Jetpack and also enabled it in my theme as follows:

function homepage_infinite_scroll() {
        get_template_part( 'content', 'home');
};

/**
 * Add theme support for Infinite Scroll.
 * See: http://jetpack.me/support/infinite-scroll/
 */
function remarkably_jetpack_setup() {
	add_theme_support( 'infinite-scroll', array(
		'container' => 'main',
		'type' => 'click',
		'wrapper' => false,
		'render' => 'homepage_infinite_scroll'
	) );
}
add_action( 'after_setup_theme', 'remarkably_jetpack_setup' );

On my front-page.php (static), I have the following code:

<main id="main" class="site-main" role="main">

		<?php if (is_front_page()) { ?>
		<?php
			//$custom_loop = new WP_Query('showposts=10&orderby=date');
			$custom_loop = new WP_Query('showposts=20&orderby=date');
				if ( $custom_loop->have_posts() ) :
					while ( $custom_loop->have_posts() ) : $custom_loop->the_post();
						get_template_part( 'content', 'home');
					endwhile;
					wp_reset_query();
				endif;

		?>
		<?php } ?>
		</main>

I don’t see the infinite scroll plugin activating, no classes are added to the body at all.

If I go to Reading in WordPress dashboard, I am unable to activate Infinite Scroll because “We’ve disabled this option for you since you have footer widgets in Appearance → Widgets, or because your theme does not support infinite scroll.”

In appearance widgets, there are no footer widgets at all, only 2 sidebar widgets.

Do you have any idea what might be missing?

Many thanks! 🙂