Error message during registration [self-hosted]

[Nathan_Crane]

I get to the registration page, enter my details and get the following error message:

404 Not Found

404: Not Found

The requested resource could not be found.

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Rocket

For info: I set it up via Synology, actually wanted to use my own domain, but that didn’t work either.
I speak German, my messages are translated with the translator.

Thanks in advance for your help.

[tgreer (Trey Greer)]

I added the self-hosted note to your title. I had a brief moment of panic when reading it