Too many dev sites .... yeah, I know!
The above might help explain a little more but basically, there are some LTI resources that do not really require a consumer key or shared secret, but Moodle is looking for them.
Noticed just now in check things on ltimoodle, certificate issue with some of the links. That could be an expired CA cert, I hope. Otherwise, there's a serious problem given the state of https (ssl/tls/etc) today.
'spirit of sharing', Ken