Missing access_token attribute for child pages - facebook

Question

I'm requesting child pages from a specific Page and I'm explicity requesting the access_token on fields but the response doesn't include the requested attribute.
Can someone help me understanding what's going on?
First of all I request the pages from an account through /v15.0/me/accounts endpoint:
https://graph.facebook.com/v15.0/me/accounts?access_token=[FILTERED]&fields=id,name,has_transitioned_to_new_page_experience,access_token
And here's the output:
{
"data": [
{
"access_token": [FILTERED],
"id": "10[...]80",
"name": "Lorem Ipsum",
"has_transitioned_to_new_page_experience": true
}
],
"paging": {
"cursors": {
"before": [FILTERED],
"after": [FILTERED]
}
}
}
Using that same id I then try to get all the child pages from that Page using /v15.0/OBJECT-ID/locations:
https://graph.facebook.com/v15.0/10[...]80/locations?access_token=[FILTERED]]&fields=id,name,access_token
{
"data": [
{
"id": "16[...]55",
"name": "Lorem Ipsum"
},
{
"id": "10[...]68",
"name": "Lorem Ipsum"
}
],
"paging": {
"cursors": {
"before": [FILTERED],
"after": [FILTERED]
},
"next": "https:\/\/graph.facebook.com\/v15.0\/10[...]80\/locations?access_token=[FILTERED]&fields=id%2Cname%2Caccess_token&limit=25&after=[FILTERED]"
}
}
But even asking for the access_token the attribute is not returned.
Some considerations:
Permissions that I'm requesting during the authentication:
"email,pages_manage_metadata,pages_read_engagement,pages_read_user_content,pages_manage_engagement,pages_messaging,pages_messaging_subscriptions"
And the account has "MODERATE" role.
Am I missing something?
Requested the API as the docs show.
Expected to get the access_token attribute.