sort by name (slug) custom post type

The “sort” query param is usually “orderby” not “sortby”, to match the SQL ORDER BY clause.

Perhaps try:

$the_query = 'posts_per_page=-1&orderby=name&order=ASC&post_type=mycustom&custom_cat=mycat';

It’s also possible that the value you are passing is incorrect, but without knowing the details of your custom post type there’s not much else I can suggest.

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