Sometimes the connection to Facebook can be lost and make it so you can't interact with your page in Retriever.
Step 1: Access the Settings panel
Step 2: Go to the Social Media Channels tab --> Click Reconnect
Step 3: Click Reconnect to Facebook and follow the steps shown.
Obs: If you're not the Admin of the disconnected page press "Ask page owner to reconnect" and the admin will get an E-mail asking them to follow the procedure shown above.