You shouldn’t use the flush_rewrite_rules function like that read the docs https://codex.wordpress.org/Function_Reference/flush_rewrite_rules#Usage
In the param “template” you have an error:
<?php the_taxonomies(array('template' => '% %l')); ?>
<?php the_taxonomies(array('template' => '%s %l')); ?>
If you are using the default value just call the function without any params
Edit: I use this code when I want just one term from a custom taxonomy:
// note the [0] beacuse the wp_get_post_terms returns all the terms from the post
$tc = wp_get_post_terms(get_the_ID(), 'categorias');
if( !is_wp_error($tc) && !empty($tc) ){
$categoria_name = $tc[0]->name;
$categoria_slug = $tc[0]->slug;
}
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