Elgg HybridAuth already supports Mastodon authorization
There is no ready-made plugin.
I saw on GitHub the Ansible configs to install Jitsi on Elgg server.
But I'm afraid you need to hire someone to do this integration.
i am no coder, but found this, and maybe can inspire Elgg coders
https://github.com/humhub-contrib/jitsi-meet
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