Hi Tobias!
In Nuki Web activate the Web API (if not already done):
https://web.nuki.io/en/#/admin/web-api
You can use the API key there to test out the API at https://api.nuki.io/
We currently do not have webhooks ready for status changes though you can see at the swagger interface that some basic preparations have been done when we released the new push notifications for our Apps.
Would you need this information instantly or just check the state regularly via the Web API?
Regarding:
This should only be some configuration issue with no impact on the API.