please add http://download.opensuse.org/ports/aarch64/distribution/leap/15.2/
there should be some magic OBS publishing hooks for publishing Leap 15.2 to distribution/leap/15.2, and it looks those need to be also put in place
for openSUSE:Leap:15.2:ARM . could you please do that? There is currently an aarch64 distribution in place that is waiting to be published.