Comment # 2 on bug 1227199 from Anirudha Ta

I too have been encountering this issue
journalctl:

Jun 30 09:28:02 Sus dbus-daemon[5265]: [session uid=1000 pid=5265] Successfully
activated service 'org.gnome.Shell.Screencast'

Jun 30 09:28:02 Sus org.gnome.Shell.Screencast[7321]: *** pw_stream_set_error
called from wrong context, check thread and locking: Operation not permitted

Jun 30 09:28:16 Sus dbus-daemon[5265]: [session uid=1000 pid=5265] Activating
service name='org.gnome.Shell.Screencast' requested by ':1.17' (uid=1000
pid=6025 comm="/usr/bin/gnome-shell")

Jun 30 09:28:16 Sus dbus-daemon[5265]: [session uid=1000 pid=5265] Successfully
activated service 'org.gnome.Shell.Screencast'

Jun 30 09:28:16 Sus org.gnome.Shell.Screencast[7382]: *** pw_stream_set_error
called from wrong context, check thread and locking: Operation not permitted

Jun 30 09:28:16 Sus gnome-shell[6025]: Screencast failed during phase STARTUP:
GLib.Error shell-screencast-error:
GDBus.Error:org.gnome.Shell.Screencast.Error.AllPipelinesFailed: All pipelines
failed to start