LXC Container im KVM Plugin

First of all, I would like to apologize for the poor English. I use a translation program. I'm having trouble with a Debian Bullseye AMD64 LXC container in the KVM plugin. When I use the Debian Bullseyse AMD64 template, I can't get to a terminal after installing and starting the LXC container created from it. The buttons for Terminal (Monitor), Spice, and any other visual access are unavailable and grayed out. The LXC-Debian container is running, network works but I can't do anything. Errors are not displayed. Finally, I created an LXC container for Pihole in Proxmox and created a template from it with ssh access (removed network interface before). I imported that into OMV (via ssh), assigned network (Macvtap Bridge) and made a few settings. The LXC container works fine. It would be better if I could visually access a container created in OMV/KVM from an offered template. I don't know what I'm doing wrong.

I'm glad that the pihole LXC container created via Proxmox works well and can be reached via ssh. I will deal with it again in the next few days, create a new container and test it. Thanks first of all.