How to fix constant reauthentication and permission issues with Facebook & Instagram
First Solution
Go to Facebook.com. Go to the top right corner and click on your profile picture, then go ahead and click settings & privacy
Click Settings
Scroll down until you see Business integrations and then click View and edit.
Make sure everything Is checked and then click Save
Second Solution
Follow the instructions from the first solution, but instead of clicking View and Edit, click Remove
Go ahead and click Remove
Now go ahead and reconnect
Third Solution
Note: First switch to the Facebook page that you have problems with
Go to your New Page Experience, which is located in the Settings of your page, and check If you have access to the page
Select the preferred user and ensure that they possess all the necessary permissions for that page
