First Solution
The first thing you can try Is changing or editing the access level
Click Socials and then Connect profiles
Once you are redirected go ahead and click Connect
Choose Facebook Pages/Groups. For this example we choose Facebook Pages
Click Edit access as shown in the picture
Make sure the page that you need has approved access and then exit out
Second Solution
Note: make sure you are connected to your main Facebook profile, where you have Facebook pages that you want to connect
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
Third Solution
Follow the instructions from the second solution, but instead of clicking View and Edit, click Remove
Go ahead and click Remove
After this go-ahead and reconnect back to Facebook, you can find the article by clicking here