Homekit "Accessory Already Added"


I was able to setup my Nuki lock with homekit, but somehow it lost connection and did not respond any more. then i wanted to remove it and readd it, but now homekit says it is already added “to add this accessory to your home youll need to reset it first”
Why tho? I do not want to set everything up again. Is there workarround?
Also the nuki app seems not of any help, it says it can not find any accessory with the name of the lock when i try to add it to homekit via the app.

any help is appreciated!



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