Doorbird in fact uses the Web API (still a Bridge needed but not the same authorization-method for you!)
As you can only use an integration once per partner on the Web API, Doorbird would need to remember the connection for another device you set up with the same user.
If they do not remember the connection between your devices (or different Doorbird accounts are used) a way to use it twice for your devices is to create a sub-account in Nuki Web.
- Go to Nuki Web / Settings / Rights management (Nuki Web)
- Add a new Nuki Web Account
- Choose an email different from your main account and a passwor
=> A new sub-account is created for your Nuki Web account (where you can also set the needed scope of rights) - Use the credentials of the sub-account to connect the second device