How to get a token for a long lifetime fb page?

if I understand correctly this scenario allows you to get a Long-Lived User Access Token. However, to obtain a Long-Lived Page Access Token, it needs an additional module. I can create it based on this information.

curl -i -X GET “https://graph.facebook.com/{graph-api-version}/{user-id}/accounts?
access_token={long-lived-user-access-token}”

Your Module from the scenario creates a Long-Lived User Access Token. When I run the module that I added, the answer is: data
[]

What could be the reason for this? Despite obtaining a Long-Lived User Access Token, I cannot generate a Long-Lived Page Access Token?