I read that Orange Pi eMMC is not compatible with Radxa boards:
Plugging an Orange Pi eMMC into the Q6A causes a short circuit on the UFS power supply lines, which triggers the immediate shutdown protection you are seeing.
Source: Windows on Radxa Dragon Q6A - #65 by nighthawk
So it is likely that it is not compatible with Radxa A7S.
However there might be workaround.