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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.
solution
I was with the same problem. The problems occurs because the plesk database do not match with the os setups.
To solve you need to add manualy all plesk database entrys in system. Sample : if you have 3 mailbox in plesk you need to see if it exists in mailserver, same to iis, dns,...
After all setups are the same in pleks database and system the deletion will work.
In my case i only add manualy 2 pop aconts that was in plesk and did not was in mailenable that the delete work.