Sorry for the delay in responding; life came up :-/
So I was finally able to add the bulb using Edge Drivers. Apparently for some reason SmartThings was prioritizing the Groovy DTH over the Edge drivers. I ended up removing the DTHs for the LZW42 (and a few other DTHs I had added but didn’t need, like NZW39 and LZW41, as SmartThings decided to try those too…) It’s weird, because the Red series dimmers I moved over just added via the Edge driver even though the DTH was still there.
Now the only thing is that the bulb only recognizes white temp, but not color control. Correction, after force-quitting and reopening the SmartThings App, the color selection was there!
Thanks @Bry and @Eric_Inovelli for all the help working through the process!