Duplicati rights managment in raspian with OMV

Hi, I first installed openmediavault on my Raspi 4, added disks and defined various shares. Then I installed Duplicati via Docker and now I want to access the configured OMV disks. Unfortunately Duplicati does not find them. I think it has something to do with permissions. But I don’t know enough about it. How can I give Duplicati enough rights to access the OMV data as well.

OMV share:

/srv/ is empty

thanks a lot