A few things that might help:
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If you have problems with the Nuki connecting to a unifi network you might try this settings: Underlaying reasons for guest network - #2 by Juergen
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Disabling/Enabling WiFi on the SL3P is asynchronous. If you do it in too fast succession it might end up in reassociation problems (which is shown as wrong password), because the device has not been properly been disconnected from the wifi before. Some routers seem to have some sort of grace period that needs to pass between attempts to join the network.
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I was able to have my EdgeRouter resolve any hostname by adding entries via the Config Tree UI to system > static-host-mapping > host-name. Works with fully qualified domain names as well as only local hostnames.