I want to add proxmox to my freshly installed authentik instance.
I have created a provider and an application named "proxmox-main"

I have also created a new realm in Proxmox and added the client secrets as well as the issuer url. Problem is, that if I click the login, I just get an error:

If I enter the issuer url, I just get forwarded to the .well-known page of my provider - and everything is fine. But if I enter the issuer url and remove the "/" at the end, I get an authentik screen that says "Not found"

I am completely lost on how to troubleshoot this. Any ideas?