Impossible to load any office document

Hello,
I have installed nextcxloud on an openmediavault 6 NAS system. This runs through a swag docker. I have a collabora container runing, but when I try to load any office document, I get a screen like the one attached. It seems that there is no connection with the collabora database runing on the system.
Thanks,
Best regards,
Harold

Nextcloud Collabora integration