Thanks for reaching out in our Community forums and for sharing your concern, I’d be happy to help.
I'm sorry to hear that you have been experiencing issues setting up your Facebook Channel. I’d love to know more about this and provide you with a solution. I appreciate you logging out and logging back in, are you able to remove the channel completely and reinstall it? If this does not fix the error, kindly provide a walk through of the steps you have followed that brought you to this error screen? This will greatly help narrow down the issue.
You can also try going through the following troubleshooting steps to ensure that this is not a local issue:
If the issue still persists in the following days, feel free to share more information by replying to this thread, or we’d be happy to continue assisting you through live chat, email, or callback. Please visit our Help Center and log in to your account to create a support request.
Feel free to let me know if you have more questions!