@eddr, @cristiano, @rexxx, @mondesensuel,

wpForo Sitemap is already available with the just released 1.5.2 version. More information in release summary: https://wpforo.com/community/wpforo-announcements/wpforo-1-5-2-is-released/

Thanks, but it doesn't work for me (after cache and permalink flashing). How is this link created? how can I debug?

If it matters, I use nginx

Maybe, it works fine for as on all kind of servers. The sitemap UR parsing function is located in  wp-content/plugins/wpforo/wpf-includes/class-seo.php file. The function is this:

public function redirect($current_object, $wpf_url_parse){
    $pattern = '#^[\r\n\t\s\0]*(?<type>\w*)-?sitemap(?:(?<paged>\d*)|_index)\.xml[\r\n\t\s\0]*$#iu';
    if( !empty($wpf_url_parse[0]) && preg_match($pattern, basename($wpf_url_parse[0]), $match) ){
        $current_object['template'] = 'sitemap';
        $query = array('type' => '', 'paged' => 1);
        $query = wpforo_parse_args($match, $query);
        $type = trim($query['type']);
        $paged = absint($query['paged']);
        if(!$paged) $paged = 1;

        if( $sitemap = $this->get_sitemap($type, $paged) ){
            $this->output($sitemap);
            $this->sitemap_close();
        }else{
            $current_object['is_404'] = true;
        }
    }
    return $current_object;
}

I have 6 sitemaps

2 profils
3 topics
1 forum

it's good ?

I have a problem with google search console...

800 erros... 

All of my links changed.

exemple : 

http://monde-sensuel.com/activity/squirt/ become  http://monde-sensuel.com/activite/squirt/

http://monde-sensuel.com/subscriptions/pistole/ become  http://monde-sensuel.com/inscriptions/pistole/

http://monde-sensuel.com/forum/members/ become  http://monde-sensuel.com/forum/membres/

why ? How can I solve that ?
I think it's that the translatation... english to french... 

All day, it's +100 errors to google search console.

very bad for my SEO !