Not reported in the public reviews. Reviewers summarise selectively, so this usually means it wasn't discussed publicly, not that it wasn't studied.
Reviewer's view of the efficacy data
FDA: healthy-animal studies show intended erythropoietic pharmacology but do not capture pharmacology in the context of anemia
“These studies provide a demonstration of the intended pharmacology of increased erythropoiesis downstream of HIF-PHD inhibition; however, they do not capture potential differences in the pharmacology within the context of anemia.”