SOLVED: Issue: First two users created via the Jellyfin API inherit session data (e.g., “Cont

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Have you tried using the jellyfin api client python?

https://github.com/jellyfin/jellyfin-apiclient-python

I haven't noticed your issue when I've used this to create multiple clients, albeit I'm not using apikeys. Rather, I'm using an access token from an elevated user.