You disabled pairing of new devices via button press. In this case you can invite yourself from another phone that is still paired or you have to factory reset the lock through the Nuki Apps help section.
In case of WIFI problems please have a look at this FAQ: Smart Lock WiFi/Thread/MQTT connection troubleshooting / FAQ
This forum is a developer and beta tester forum and not a general support forum. If you need support please contact the support team through the Nuki App.