Just wanted to mention that in addition to the two different Alexa/smart things bugs that have popped up recently, the one where echo says she can’t reach SmartThings and the one where SmartThings devices don’t show up correctly in Alexa routines, Logitech has also very recently deprecated the red skill and somewhat modified the blue skill.
This means that the native Alexa/Harmony integration now works a little differently than it used to. That part isn’t a bug, it’s a change, but it can be confusing and logitech doesn’t seem to put out any news bulletins or email blast about it. They just changed it and changed their own support page about the integration.
Since I had both the red skill and the blue skill enabled and have been using both, this really drove me crazy until I figured out what was going on, and that took talking to both Amazon and logitech support. 
Anyway, just wanted to mention it in case anyone else was running into the same thing in the middle of trying to track down the bugs.
See the following thread for discussion on that specific change,