I'm also getting the 400 in the logs. After the api service logs a status 400 the admin service logs this:
admin-1 | 2026-06-16T21:36:43.802074Z WARN fluxer_admin::routes::system_actions: admin API request failed: update instance config error=HTTP 400: {"code":"INVALID_FORM_BODY","message":"Invalid form body.","errors":[{"path":"issuer","message":"Invalid URL format.","code":"INVALID_URL_FORMAT"}]}
This happens regardless of what the URL actually looks like.
https://auth.example.com/application/o/fluxer-test, https://auth.example.com and auth.example.com/application/o/fluxer-test don't work.
The message in the admin panel when saving could also print out the error instead of a green "Done.", but that's another issue.
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Comment by @Nome200
https://auth.example.com/application/o/fluxer-test,https://auth.example.comandauth.example.com/application/o/fluxer-testdon't work. The message in the admin panel when saving could also print out the error instead of a green "Done.", but that's another issue.