[BUG] org.freedesktop.portal.Screenshot portal does not exist when using PAM with fprintd or modified greetd

[MartianInGreen]

When using a system with PAM (and fprintd) enabled org.freedesktop.portal.Screenshot portal does not exist.

Originally stemming from pop-os/cosmic-screenshot#68 I think this is most likely a cosmic-comp issue.

This is regardless of the actual login method used for first login, so happens both when login in with a fingerprint and password as long as the option to login with a fingerprint is enabled (but failed).

This might also be related somehow to the fact that I don't thing cosmic-greeter is handling finger print auth correctly? On first login there is just a confirm button you have to press and hold your finger on the fingerprint reader and pray it works.

PAM configuration (at /etc/pam.d/cosmic-greeter)

# Account management.
account required /nix/store/m5mhqggiq2pgq0q92pw8lwzilk08kary-linux-pam-1.6.1/lib/security/pam_unix.so # unix (order 10900)

# Authentication management.
auth sufficient /nix/store/znz29vh4d4a3vswpzkh4v7izz28g18m6-fprintd-1.94.3/lib/security/pam_fprintd.so # fprintd (order 11400)
auth sufficient /nix/store/m5mhqggiq2pgq0q92pw8lwzilk08kary-linux-pam-1.6.1/lib/security/pam_unix.so likeauth try_first_pass # unix (order 11600)
auth required /nix/store/m5mhqggiq2pgq0q92pw8lwzilk08kary-linux-pam-1.6.1/lib/security/pam_deny.so # deny (order 12400)

# Password management.
password sufficient /nix/store/m5mhqggiq2pgq0q92pw8lwzilk08kary-linux-pam-1.6.1/lib/security/pam_unix.so nullok yescrypt # unix (order 10200)

# Session management.
session required /nix/store/m5mhqggiq2pgq0q92pw8lwzilk08kary-linux-pam-1.6.1/lib/security/pam_env.so conffile=/etc/pam/environment readenv=0 # env (order 10100)
session required /nix/store/m5mhqggiq2pgq0q92pw8lwzilk08kary-linux-pam-1.6.1/lib/security/pam_unix.so # unix (order 10200)
session required /nix/store/m5mhqggiq2pgq0q92pw8lwzilk08kary-linux-pam-1.6.1/lib/security/pam_limits.so conf=/nix/store/d5jz0d6fnf0v2gz6hzhy290lsmk1ggcj-limits.conf # limits (order 12200)

[Drakulix]

Honestly sounds more like an xdg-desktop-portal-cosmic bug. Ping @ids1024 any idea?