API access blocked (OAuthException code 200) for long-lived user token (FACEBOOK)

Question

I'm running into an issue when trying to fetch data from a Facebook ad account via the Marketing API.

• I’m using a long-lived user access token created by the account admin.
• The user associated with the token has full access in Business Manager.
• Previously, the request /me/adaccounts worked and returned active accounts, but now it returns the error:

{'error': {'message': 'API access blocked.', 'type': 'OAuthException', 'code': 200, 'fbtrace_id': 'ANGfnFiboGN3X77OVXvprlu'}}

Example code causing the error:

import requests
access_token = "..." 
url = "https://graph.facebook.com/v23.0/me/adaccounts" 
params = {"access_token": access_token} 
response = requests.get(url, params=params) 
print(response.json())

I also tried fetching dashboard data via /insights for a specific ad account, but get the same error:

import requests, json, pandas as pd
access_token = "..."
ad_id = "act_7167..."
url = f"https://graph.facebook.com/v23.0/{ad_id}/insights"
time_range = json.dumps({"since":"2025年01月01日","until":"2025年09月01日"})
params = {
 "access_token": access_token,
 "time_range": time_range,
 "level": "ad",
 "fields": "date_start,date_stop,spend,impressions,frequency,cpc,ctr",
 "breakdowns": "country",
 "time_increment": 1
}
response = requests.get(url, params=params)
data = response.json()
if "error" in data:
 print("Error:", data["error"])
else:
 df = pd.DataFrame(data["data"])
 print(df.to_string())

Why does a valid long-lived user token still fail for /me/adaccounts and /insights?

• C3roe: Are you saying with a short-lived token everything works as it should?
• T-Dog: Did you manage to fix it? I am having the same problem and don't know why..