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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.
This is a well known bug in 17.8.11. The "Advisor" wrongly advises the true http/2 status and... it's never been fixed.
We asked the question elsewhere i.e. if this specifc Advisor bug had been fixed for Obsidian but our question wasn't answered. To be fair, quite a few bugs that are still in 17.8.11 have, actually, been fixed in Obsidian, or so the officlal Plesk records to date, do indicate. Your post would indicate that this one has not been fixed... so maybe that's why we never got an answer We haven't upgraded to Obsidian - yet - as we're still reading through other people's experiences so far.