Activation key not working on my self-hosted n8n instance

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But when I try to activate it inside Settings → Usage and plan, I get this error:
“Activation failed — Activation key has already been used on this instance.”
This is a brand-new install on a new VPS.
I haven’t used this key anywhere else before.
Environment details:
Deployment: Docker Compose
Reverse proxy: Caddy
Domain: https://n8n.nullisland.ovh
Version: Community Edition (latest)
PostgreSQL + Redis (queue mode)
What I have tried:
Removed the activation tables from PostgreSQL
Reinstalled containers
Re-created .env
Fully rebuilt Docker stack
The error still appears every time.
Could you please help reset this activation key or check why it thinks it is already used?
Thank you!

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Information on your n8n setup

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The activation key is for the Community Edition. And it seems like you are already registered.