No access from extern

Operating system

Linux

Joplin version

3.0.1

Sync target

Joplin Server

Editor

Rich Text Editor

What issue do you have?

Hello everyone,
please excuse my poor English.
I hope you can help me.
I have installed a Joplin server in an unraid docker and can log in to the LAN properly. I can't access it externally via the Android app and I don't receive an activation email and when I try to access Joplin externally via the browser, I get an error message: Invalid origin: http://joplin.myurl.duckdns.org
If I enter the wrong protocol or something else for the IP, I get ‘Bad Gateway’, so I think it must be something to do with Joplin itself.
The redirects on the router work, as I can also access all other Docker containers.
I have made the configuration and mail settings for the Joplin Docker container as follows.

Note: I have also tried a direct port release on the router and tried the ‘http://feste IP of the router:port’, but I get the same error.

Can anyone tell me what I need to do to access the server externally?
Thank you very much.

Screenshots

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