OpenCloud Desktop

Hi
Does anyone got running the Opencloud Desktop application? I stuck at the login, getting a 403 forbidden error on the login site in the browser. The WebApp is runninig fire via my reverse proxy. (npm)
Any ideas. Btw, i have no ios device to test, only android. But there is no app for now…

The URL is:
https://oc.mydomain.net/signin/v1/identifier/_/authorize?response_type=code&client_id=OpenCloudDesktop&redirect_uri=http://127.0.0.1:42007&code_challenge=K7HA2zDL5O34bZ6DuqNQAf0K98y32VgmZRne8P88dcM&code_challenge_method=S256&scope=openid%20offline_access%20email%20profile&prompt=consent%20select_account&state=5LMM7TnOvYimE9Ok-0uMr6DWEfSDb8QY67EQagV_X0w%3D

The same happens with a windows client. So thats not nixos related. I have to ask the opencloud devs…