19021: Only one channel can be set as primaryERROR: 19021error-19021 page anchorERROR Descriptiondescription page anchoris_primary can be set to true only for one channel Possible Causespossible-causes page anchorRequest with is_primary set to True for more than one channel Possible Solutionspossible-solutions page anchorEnsure only each channel has only 1 is_primary set to true