Attached tdm.log is from Fedora 39. In past several years through last spring, I've had nominal trouble running the TDE for latest release on whatever release is upcoming, in this case, F38>F39. This one on Kaby Lake host ab250 won't more than pretend to start a TDE session either from startx or TDM. Attempting to start one brings some screen flashing, then TDM returns. Selecting IceWM session instead of TDE produces same result. I find no clues to session failure in journal, dmesg, Xorg.X.log or .xsession-errors, while tdm.log grows from 0 to nearly 40k from just starting, before any attempt to login.
An unlogged clue may be seen in session type selection: no matter what is selected for current session (attempt), on the next return to session selection, "previous" remains where it was before the upgrade from F38 to F39, on the second of the two TDEs, right above failsafe.