Facebook app marketers: Make sure your apps are set to Live Mode - Marketing Land
https://feedxmedia.blogspot.com/2019/09/facebook-app-marketers-make-sure-your_27.html
Starting October 23, apps set to Development Mode will not be able to access certain levels of data connected to users interacting with the app's integrations (such as Pages or ad account information).
from Marketing Land - Marketing News & Management Insights
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