This is not correct. n8n also supports self-hosted SeaTable Servers.
This is a screenshot from n8n Cloud which I use:
I tried with two self-hosted systems. It worked.
I am based in Europe.
Have you tried with the self-hosted version of n8n?
https://dtable-server.seatable.cn/ is no valid domain. This cannot work. Open the URL in your browser. Then you see the error message that n8n returns as well: “You don’t have permission to access.”
https://cloud.seatable.cn is a valid host address. So it should work.
But: Where did you create the api token? This one here:
In n8n, please use the host address of this system.
Sure, but on which system?