Hi @Canzoni, and welcome!
While i do not use, or even have, a finger print reader, and will most certainly not be able to help you, maybe you can get more info here:
https://www.reddit.com/r/linux4noobs/comments/9vwk99/fingerprint_reader_on_manjaro/
https://www.reddit.com/r/ManjaroLinux/comments/epgrdh/fingerprint_on_manjaro/
https://wiki.archlinux.org/index.php/Fingerprint_GUI
Also, please see
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