greeter requires both a password and finger print to log in

### What Happened?

when attempting to log in on system boot, I am required to first input my password and then touch my fingerprint sensor to log in successfully. If I do not touch my fingerprint reader within the timeout period, I am given a generic login error and am told to try again. If I only touch my fingerprint reader without entering the password, nothing happens.
This happens on my fresh arch install that I've made sure not to install too many things on.

### Steps to Reproduce

add a finger to fprintd
add fprintd as a sufficient method of auth to /etc/pam.d/system-auth
try to log in on first boot (lock screen works fine but I'm pretty sure that is a different service)

### Expected Behavior

greeter should let you to either use your password or use your fingerprint not both (and especially not require both and not say anything about needing the fingerprint)

### OS Version

8.x (Circe)

### OS Architecture

amd64 (on most hardwares)

### Session Type

Secure Session (Wayland, This is the default)

### Software Version

Latest release (I have run all updates)

### Log Output

```shell
relevant logs from journalctl with the word greeter in them

Mar 12 10:42:01 Sammypants-Laptop greetd[756]: config: Config { file: ConfigFile { terminal: ConfigTerminal { vt: Specific(1), switch: true }, general: ConfigGeneral { source_profile: true, runfile: "/run/greetd.run", service: "greetd" }, default_session: ConfigSession { command: "dms-greeter --command niri -C /etc/greetd/niri/config.kdl", user: "greeter", service: "greetd-greeter" }, initial_session: None }, internal: ConfigInternal { session_worker: 0 } }
Mar 12 10:42:01 Sammypants-Laptop greetd[757]: pam_unix(greetd:session): session opened for user greeter(uid=964) by greeter(uid=0)
Mar 12 10:42:01 Sammypants-Laptop systemd-logind[676]: New session '1' of user 'greeter' with class 'greeter' and type 'tty'.
Mar 12 10:42:01 Sammypants-Laptop (systemd)[768]: pam_warn(systemd-user:setcred): function=[pam_sm_setcred] flags=0x8002 service=[systemd-user] terminal=[] user=[greeter] ruser=[] rhost=[]
Mar 12 10:42:01 Sammypants-Laptop (systemd)[768]: pam_unix(systemd-user:session): session opened for user greeter(uid=964) by greeter(uid=0)
Mar 12 10:42:01 Sammypants-Laptop systemd-logind[676]: New session '2' of user 'greeter' with class 'manager-early' and type 'unspecified'.
Mar 12 10:42:02 Sammypants-Laptop systemd[1]: Started Session 1 of User greeter.
Mar 12 10:42:02 Sammypants-Laptop dms-greeter/niri[801]: 2026-03-12T15:42:02.331383Z WARN smithay::backend::drm::device::fd: Unable to become drm master, assuming unprivileged mode
Mar 12 10:42:02 Sammypants-Laptop dms-greeter/niri[801]: 2026-03-12T15:42:02.515083Z WARN niri::backend::tty: error binding wl-display in EGL: EglExtensionNotSupported(["EGL_WL_bind_wayland_display"])
Mar 12 10:42:13 Sammypants-Laptop greetd[757]: pam_unix(greetd:session): session closed for user greeter
Mar 12 10:42:25 Sammypants-Laptop (sd-pam)[771]: pam_unix(systemd-user:session): session closed for user greeter
```

### Hardware Info

laptop, intel cpu, whatever fingerprint reader is on current generation dell laptops (in my case, dell 14 plus db14250)