Am I eligible for the Dependent Child Tax Credit in 2021 if I filed for an extension and did not file my 2021 return until August 2022?

We moved abroad in August 2021, but lived in the US Jan. 1, 2021-Aug. 17, 2021 (more than the required 6 months to qualify for this credit). I am trying to figure out why we didn't receive the Dependent Child Credit even though we qualified.