I could add them to the hubb after a little fiddling around but the device handler isn’t compatible with the new app according to the developer. I’m supposed to get options in the main menu to register rfid tags and they are not there, making it useless.
edit: here is his post.
Update, 16 October 2020.
This device handler was designed for the original SmartThings app (the “SmartThings Classic” app). The SmartThings classic app was shut down by Samsung on the 15 October 2020 (despite protests), causing it to stop working, and forcing users to migrate to the new app. I noted that this device handler, or a port of it, appears to exist in the new app, but doesn’t work correctly (there is no main UI page, which contained the controls necessary for registering/unregistering RFID tags). I couldn’t easily see how to fix this (or indeed, if fixing it was possible, or even whether custom device handlers are still supported).
I also noticed that the new app would not allow me to edit some of the more advanced conditions in some unrelated automations I have.
Altogether, …