So far I've tried several images, just wanted to update what has and hasn't worked. I know the rz isn't officially supported but I thought I'd give my feedback and maybe it will help someone. All images were written to emmc after first using the radxa-zero-erase-emmc.bin tool to erase and mount emmc as USB storage.
Armbian_22.05.0-trunk_Radxa-zero_bullseye_current_5.10.113_minimal - doesn't boot
radxa-zero-ubuntu-focal-server-arm64-20220501-0334-mbr - boots but just goes straight into login screen, no option to change password. root and 1234 do not work. Also no armbian_first_run.txt.template included in the image
Armbian_22.02.3_Radxa-zero_jammy_edge_5.15.32_xfce_desktop - doesn't boot
Armbian_22.02.3_Radxa-zero_focal_current_5.10.109_cinnamon_desktop - doesn't boot
Armbian_22.02.3_Radxa-zero_bullseye_current_5.10.109 - doesn't boot
Armbian_22.02.3_Radxa-zero_focal_current_5.10.109_xfce_desktop - doesn't boot
Armbian_22.02.3_Radxa-zero_jammy_edge_5.15.32 - doesn't boot
I have a couple of zeros so I went back and forth between the two testing the images. Used DD and Gnome Disks, neither had any luck. Currently running DietPi which seems to be doing well. CoreElec runs good too.