iobroker on docker on OMV4 on Intel architecture - who has a working setup?

I spent a whole day trying to run iobroker as docker on my OMV4 with no success. I tried various packages & setups and none gets to the webUI. In detail I tried

• image: buanet, docker, angelnu
• network host, mcvlan
• folder mounted or not
• noexec flag for mounted folder deleted
• tried -it flag

Of course I read the howto by buanet. Many solutions appear to work on NAS. In my case I run OMV on a NUC. I run various other docker images on this machine without any problems.

When starting one of the tested iobroker images they all appear to start (at least their status is "running" but there is no access to any webUI (<host>:8081 or <mcvlan>:8081

Who has a recent working setup on an Intel machine and could share the settings?

I do not use portainer. I use the native docker UI in OMV. Yes, I keep checking the logs.