How to fix "Could not connect to Freedesktop Remote Desktop Portal" in KRdp?

From systemctl --user status app-org.kde.krdpserver.service:

kwi 18 23:10:08 demon systemd[1332]: Starting app-org.kde.krdpserver.service - KRDP Server...
kwi 18 23:10:08 demon systemd[1332]: Started app-org.kde.krdpserver.service - KRDP Server.
kwi 18 23:10:08 demon krdpserver[2268]: org.kde.krdp: Could not connect to Freedesktop Remote Desktop Portal

and it looks like KRdp does not even start to listen for incoming connections as trying to connect with KRDC results in immediate The connection to the server was closed. error with no new entries in KRdp logs.

How to fix this?

Operating System: Fedora Linux 42
KDE Plasma Version: 6.3.4
KDE Frameworks Version: 6.13.0
Qt Version: 6.8.2
Kernel Version: 6.14.2-300.fc42.x86_64 (64-bit)
Graphics Platform: offscreen
Processors: 12 × AMD Ryzen 5 7600 6-Core Processor
Memory: 14.8 GiB of RAM