• Debian 11 is approaching its end-of-life (vendor EOL date - August 31, 2026). Plesk Obsidian 18.0.80 will be the last release to support it.
    If you are running Plesk Obsidian on Debian 11, we recommend you upgrade those servers to Debian 12 using our dist-upgrade tool.
  • We plan to deprecate and remove the support for XML RPC protocol versions earlier than 1.6.9.1 in Plesk Obsidian 18.0.82. We strongly recommend that you update all existing integrations using earlier versions of the XML RPC protocol to comply with the version 1.6.9.1 specification.

Resolved Fresh Install CentOS 8

I couldn't quickly find any information that proxmox/CT mode is supported and Plesk working is guaranteed in that environment.
Have you tried to install Plesk in KVM mode? You can post error messages right here (it helps better) or attach a log to the thread. I am not an expert in proxmox but maybe someone from the community could help.
I was able to copy&paste some of the log in this file. If you need more, I will try to install it again and copy all log.
 
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