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I am using facebook's business onboarding API for my clients to create Facebook ads. The Facebook marketing API version is v4.0 and we are using "PHP facebook graph SDK" for all the API calls. My application flow for creating a Facebook campaign is as follows: 

1)Create a Child Business Manager for a client Facebook account  
2)Set Up Payment Method    
3)Get the Child System User Token 
4)Fetch the System User's ID    5)Get the Funding Source ID   
6)Create a New Ad Account with the Default Funding Source    7)Add
the System User as an Admin to the New Ad Account    8)Claim a page
for  business as an AGENCY,[Document link]
(https://developers.facebook.com/docs/marketing-api/business-manager/asset-management#pages-claim)
9)Assign system to the page,[Document link](
https://developers.facebook.com/docs/marketing-api/business-manager/asset-management#pages-add-people)

Before assigning a system user to the page I am calling GET API
<https://graph.facebook.com/v4.0/{PAGE_ID}/assigned_users?business={business_id}> for reading specific permission for the Facebook page But this API call results in error "(#10) This endpoint requires the 'manage_pages' permission or the 'Page Public Content Access' feature. Refer to https://developers.facebook.com/docs/apps/review/login-permissions#manage-pages and https://developers.facebook.com/docs/apps/review/feature#reference-PAGES_ACCESS for details."

I am using system user access token for this API and I have already provided manage_pages permission for tokens. What is the reason for this error? Do I need 'Page Public Content Access' permission as well?

Hamed
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Jyoti Tambare
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  • you have to get privileges of manage_pages from facebook developer console if you dont have then you have to get access from from facebook before accessing – Mayank Pandav Feb 18 '20 at 05:53
  • I already have manage_pages permission – Jyoti Tambare Feb 18 '20 at 06:52
  • _“Do I need 'Page Public Content Access' permission as well?”_ - well that’s what https://developers.facebook.com/docs/graph-api/reference/page/assigned_users/#feature-permissions suggest at least. Kinda makes sense, I suppose - because currently, your system user does not have admin access to the page already. So this query has to be treated as a “public” one then. – misorude Feb 19 '20 at 07:42
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    @JyotiTambare Dis you get solved this issue, I need a help If so – Ajith Apr 16 '20 at 11:30

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