This warning means Ads Editor didn't find a valid Meta connection in your session. Open the Connect Meta page from the menu, sign in with Facebook again, and authorize the requested permissions. Then go back to the Account Center and click Refresh. If the Account Center loads but some accounts show a dash in the metrics and a gray dot in the status, the problem is access to those accounts: the connected Facebook profile no longer has permission for them in Business Manager. In that case, check access in Meta or connect the profile that manages those accounts.