get_posts – get all posts by array of author

Use author__in not author as a query parameter.

$authors = [ 1, 2, 3, ];

$current_user_posts = get_posts( [
    'author__in'    =>  $authors, 
    'orderby'       =>  'random',
    'post_per_page' => '1',
    'order'         =>  'ASC' 
] );

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