I've just installed Emacs 26.2 on a Windows 7 machine. This is a clean install, with no previous version of Emacs installed. Editing an Org file, I want to insert a new TODO item using "M-S-return". Typing that key sequence results in an error "ESC <return> is undefined."
Since I'm not running in a terminal, the issue doesn't seem to be the terminal eating my keys, as discussed here. Also, C-h l (view-lossage) results in the following:
F [org-self-insert-command] o [org-self-insert-command] o [org-self-insert-command] <escape> <S-return> [nil] C-h l [view-lossage]
So it appears that the "Shift-return" is making it to emacs.
C-h m lists
<M-S-return> as bound to
org-insert-todo-heading, as expected.
C-h k says
ESC <S-return> (translated from <escape> <S-return>) is undefined.
What am I doing wrong here?