Cannot claim new Plex server

Good day!

I am currently trying to activate/claim a new installation of Plex as a an LXC container or Docker container on a Heztner hosted server.
The configuration of the container is all well and good and, accessing the Plex container via local subnet IP works, prompting me to sign in.
Once signing in with my Plex Pass account, I am immediately locked out of the server: Not authorized
You do not have access to this server.
Following multiple potential fixes, I thought retrieving a claim token and manually registering the server would be my path to success. So, in the Plex Docker container’s terminal I ran:

curl -X POST 'http://127.0.0.1:32400/myplex/claim?token=claim-[TOKEN]'

which output XML to screen. Santised example below:

<?xml version="1.0" encoding="UTF-8"?>
<MyPlex authToken=
…
subscriptionActive="1" subscriptionState="Active">
</MyPlex>

Still, I am simply unable to access this instance, receiving the same “Not authorised” error.
WTH is going on here? This should really be simple. My server, my login, my service.

Please provide clear instructions to force adoption of this service. I have an Nginx Proxy Manager reverse proxy, negating the need for forwarding of port 32400, allowing me to access the instance via https://plex.fqdn - if this is relevant and a hurdle to adoption, I have also attempted to complete resgistering via IP and a forwarded port 32400, which resulted in the same failure to register correctly; Not authorised.

Do a Plex search for Hetzner.

Plex is pushing home use and moving away from VPS.

Ah, understood. Thanks for clarification.

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