Group access and Access token?

Question

PHP

Hello. Previously, I somehow received an access token for the application forever. Created a link like this:

https://www.facebook.com/dialog/oauth?client_id=APP+ID&redirect_uri=MY_PAGE&scope=user_status,offline_access,read_stream,manage_pages,publish_stream,user_groups

More specifically, I need access to groups and post on their behalf at any time. As a result, I get a redirect to my script with the CODE parameter . I used it as an auth token before, it looks like this:
(changed some symbols):

AAAGeNVsJRxMBAC71rMePZAkoZA2KUt7uTCReuqQPj6Rzz9o3M1d8XL1ZBIjSpDGYZAnuuPaTyfZAOgOeKkZALumAUkEFkyb7xN8CkCoDmwnZAAreZAYugnak

Now CODE returns me:

?code=AQAGeqYYMBfFXrPUzfuSCQb9GNtreg2rog9KVixcRDhccoug2vy5qCOv4y175TVccqs8TGIJGKJAoLzmFxaaoKgKp-iUNmc4hAfZETwGW7l72wki1JqGlHXsRuhUpzfHTUexT_nEDt4nzaFxHHSm-sTvmbYFB6VzLeiuRFK4R4MBfprk3sbjUPR6V_Cumjey4RUrHfPDzaHUIowJrKGTey2q#_=_

I decided to do the same, but through the Graph API Explorer . It allows you to get the rights you need or use an existing application and create requests. Through it, I can generate a valid token, but I cannot get the list of groups: GET /me/groups returns an empty data array. There are rights to access groups. What's wrong?