Did some testing, at the large Canon plug, measured continuity between pins A and B. On no-stow, continuity measured between A and B. When pushing the switch, which is the Stow position, continuity NOT measured. This is the expected result, but no EICAS message indicates in the cockpit console.

Wild guess, but thinking that the warning for a failure to Stow the Door Handle may not be configured to display this warning. It may be a configurable option.