OK, thank you... was looking for the script on google...😁
I can confirm that the entries marked after "openmediavault" in the original /etc/fstab on the SD were not copied to /rootfs/etc/fstab in emmc.
After copying them manually, and reboot, OMV and docker started correctly.
Only two disks appear as missing from OMV, but all services seem ok, so I will post this question on the OMV forums, as I think it is best suited there.
eClapton got a reaction from MaxT in Helios64 - BookWorm Armbian 25.8.1 - After armbian-install to emmc OMV7 does not let me in, disks not mounted... what gets copied?