ok, i got my Alexa skill straightened out with Lars’ help. A couple things to try if you’re having trouble:
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check the Alexa website for duplicates, not the app. I thought I only had ~5 duplicates out of ~190 devices based on the Alexa App. But the website https://alexa.amazon.com/ showed many more duplicates in the Smart Home section. As Lars mentioned above, go down the list and any SmartThings devices that shows its connected through a service longer than plain “SmartThings” is from the Classic skill and you should click Remove on it. (hint: sort by oldest to bring devices from the Classic skill closer to the top). The new skill is shown below and should be left alone.
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Once all your duplicates from the Classic skill are removed, go to Skills > Your Skills and find the SmartThings skill. Click Remove. (this will not remove the existing devices connected through the new skill). Then Add the SmartThings skill back and discover devices. Without doing this, all of my switch and dimmer devices showed disconnected in Alexa after the duplicates were removed.
That should get everything synced back up. The bad news is you will probably have to re-do all of your Groups/Rooms in Alexa to get things organized. But now routines, lights and groups are working correctly. Only my Powerbot vacuum isn’t working through the new skill, so i’m leaving it on the old Samsung skill for now.