SAML Login not working with Authentik

[TheEndOfEverything]

Infos:

• Used Zammad version: 6.4.1-1740652408.e0e2155d.bookworm
• Used Zammad installation type: Proxmox LXC
• Operating system: Debian 12 (container); Proxmox 8.3.3 (hypervisor)
• Browser + version: Mullvad Browser 14.0.5 (based on Mozilla Firefox 128.7.0esr); Chromium 133.0.6943.141

---

I am trying to set up SAML login with Authentik. I have followed the official instructions on the Authentik Wiki, but there are two issues:

1. The Name Identifier Format field, which I apparently should leave blank, is a mandatory field.
2. I put the phrase “empty” into the field, in case the guide was more literal than I thought. With this configuration, I get the following error: