I’ve been using my Google home to control my Smartthings devices for a long time now. Recently I enabled the ability for G Home to recognize my voice and link to my accounts specifically. Use that for a little bit and it was being more trouble than I wanted as it often didn’t recognize me and would tell me it couldn’t do something with Harmony or Our Groceries or other linked services.
So I turned that off, which also evidently unlinked it from my Google account. Smartthings suddenly all stopped working - I would get “sorry I don’t how to do that or sorry I’m learning all the time but can’t do that yet.”
So I re-enabled that feature to identify me and linked my account back to Google Home. Unfortunately all Smartthings are still unable to work from Google home. I get the same “sorry I don’t how to do that yet” response when I ask it to turn on any lights. I removed and re-added my Smartthings account from Google home, removed and re-added all my devices from Google home. Nothing works. I also rebooted my Google home.
Everything does work from Google Assistant on my phone. So I know the connections are still there, and I know they can be controlled.