Access the MetoCRM panel.

Click on Integration > Facebook Messenge in the left main menu.

Press the New button located in the top right corner

In the Facebook Business Messaging section, click on the Add Facebook Page button.

Select the Facebook account for which access is requested from the screen that opens.

You can choose your page selection by clicking on the Edit previous settings. button.

Once completed, within the MetoCRM page, select the groups that you want to have access to your connected Facebook Messenger page from the area labeled select group.

Warning: After completing the steps, don't forget to test message reception and sending in the system.