Getting checkout session from a connected account paymentlink – PHP

I am using php and have stripe main account, with some connected accounts.
On those accounts I created payment links and I could add a redirect link (after completing payment), in which I added the placeholder for the session_id (automatically added).

The success page I created should get the checkout session, but somehow I am unable to get it from the connected accounts.

I can’t find in the stripe docs how to do that, only from the main account (session_id)

Does anybody know howto and have some good docs?

I got an error:

The resource ID cannot be null or whitespace

This is code I use:

$stripe = new StripeStripeClient('sk_live_......');

$acc = $stripe->accounts->retrieve('acct_.....', []); // This shows some data of that connected account.

$session = $stripe->checkout->sessions->retrieve($_GET['session_id'], [], ['stripe_account' => 'acct_....']);  

the session_id in the url is correct (as I see it on the dashboard of stripe), but as I do not get any data from the connected account regarding any payments, its hard to find it.

I am pretty new with this, so any guidence would help.

Extra update

I changed the following line and got also info of the session (id, amount, email who paid, etc):

$session = $stripe->checkout->sessions->retrieve($_GET['session_id'],['expand' => ['payment_intent']], ['stripe_account' => 'acct_.....']);

The only error I am getting is:

Fatal error: Uncaught StripeExceptionInvalidArgumentException: The resource ID cannot be null or whitespace

No idea why I still get that error or what I miss.