Why error subscribing to specific mailchimp list

In my laravel 5.7 app I make subscribe/unsubscribe to lists of mailchimp using https://github.com/spatie/laravel-newsletter It works when ok and all users are suscribed to the current mailchimp list, which is described in .env file

MAILCHIMP_APIKEY = NNNNNNNNNN
MAILCHIMP_LIST_ID = NNNNNNNNNN  # ID of 'subscribers' mailchimp list

But as my site has several group news I try subscribe to mailchimp list with code :

$retData= Newsletter::subscribe($userProfile->email, ['FNAME'=>$userProfile->first_name, 'LNAME'=>$userProfile->last_name], 'subscribers'); // 3rd parameter can be different

where 3rd parameter is mailchimp list name, as I see it on the server as : https://prnt.sc/mqbgnb But I got error :

There is no list named `subscribers`.

Why error? Misconfiguring of of this mailchimp list ? It has some options, I am not sure if some of them is related to my issue ?

In doc I read as :

//Subscribe someone to a specific list by using the third argument:
Newsletter::subscribe('nanny.ogg@discworld.com', ['firstName'=>'Nanny', 'lastName'=>'Ogg'], 'Name of your list');

How to fix my error ?

Thanks!

via Chebli Mohamed