The minimum approach in order to get a new Toniebox to connect to your Teddycloud is exchanging the CA certificate on the Toniebox (or in case of CC3200, add it in addition to the original one). Each Toniebox has to use the CA certificate of your Teddycloud - otherwise the (https) communication is not possible. And to achieve this you absolutely have to flash each box.
Do you mean the “Allow new boxes” switch? It’s a security feature. Should be turned off most of the time except you want to explicitly add a new Box (that has been flashed before).
I had hopes, Flashing a box is so anoying.
If I reset a box (add charger,turn and pinch both ears) do certificate also reset?
There is a plan to give tonyboxes to other with childs or sell it on local baby Whatsapp groups.