It seems i am missing some important info on how to configure the additional applications on IncusOS.
I installed mm with incus admin os application add -d '{"name":"migration-manager"}'
In the logs i can see port 8443 is already occupied by the default incus application.
How would i set the listener address and port for example or how do i delete an application?
Oh, yeah, we should add some logic to prevent you from doing that 
Basically IncusOS can have one of three “primary” applications:
- Incus
- Migration Manager
- Operations Center
Those should not be co-installable and only a single primary application should ever be allowed. Partly to avoid the port conflict issue but also because those applications are internally allowed to interact and reconfigure IncusOS, so you don’t want them to conflict with each other.
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Ah thats why, i thought i can define them on different ports on the same host in incusOS.
So basically i create an incusOS virtual machine in incus ( with the preseed config generator for example) and treat those as separate service instances?
Is that somewhere mentioned in the Docs that I should install either but not several applications on the same incusOS instance? I clearly missed that then
Thanks again for clear things up for me! 
Well….and is there a way to remove those applications or do i need to reset incusOS and start fresh? 