When you add a Facebook Page to your Business Manager, you’re claiming your business owns that Page.
Note: Adding a Page to your Business Manager account is not the same process as claiming responsibility for a Page. You must go through the business verification process to do this. Learn more about business verification.
To add a Page to your Business Manager:
Note: Anyone who had access to the Page before it was added to Business Manager will still be able to access and manage the Page.