this is the reason =
All DEs now often fail to send SMS Verification Code from Google/GMAIL, Only
GNOME-SESSION-FLASHBACK is always successful (installed in XFCE4 session).
Debian should make =
DEBIAN NON FREE Gnome-Session-Flasback
Don't mix it with GNOME-SHELL
Cause Gnome-Shell is too heavy with Wayland.
make it like another desktop environment =
Debian Non Free with LXDE, LXQT, XFCE4, GNOME, KDE, MATE, CINNAMON
Thank you