问题
I'm attempting to connect a Facebook Messenger App to one of my pages.. I've connected Facebook Messenger Apps to pages before.
But this is the first time I've received this error...
What gives?
回答1:
This is a bug and we are currently working on it. In the meantime, please use our beta tier or generate the page access token through our API. To use the beta tier, you can access the following:
https://developers.beta.facebook.com/apps/89000000000000/messenger/
回答2:
we got same error and here is helpful answer https://developers.facebook.com/bugs/281723762198561/
回答3:
In my case, my app was live which was preventing access token generation.
Just go to app dashboard and disable the live checkbox as below:
来源：https://stackoverflow.com/questions/38909309/facebook-messenger-app-invalid-scope-permission-pages-messaging-subscriptions