Please check if the Facebook profile used for ad account connection still has admin rights to the ad account you have selected when creating a rule.

For example, the screenshot below shows that Alla has admin rights to the Bïrch Facebook ad account (in your case, your profile should have admin toggles on for all the Facebook ad accounts you need to use here).

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Please note that it’s important to check specifically profile through which ad account is connected to Bïrch in Integrations section. Once checked, please reconnect the Facebook profile to Bïrch (while logged in to Facebook under the same profile).