Access denied from nextcloud when used device security

Ns8
Ciao a tutti , dopo aver create l’utente admin su ns8 finalmente utente amministratore è attivo per l’intero sistema .
Purtroppo credo di aver dimenticato qualche parametro importante relativo a nextcloud , ovvero si crea una omonimia per il nome , differenziata solo dalla password .
Example , if I log in to s anextcloud with the admin user , but with ns8 administrator password , the system lets me in with the ns8 profile . If I log in with admin but nextcloud password, the system lets me in with nextcloud profile. So far everything is fine. The problem arises that if I activate the access with a security device, in my case a fingerprint of mac os, only the admin user does not work, as by typing admin, since there is this homonymy the system responds with “no registered device”, despite the key has been registered in porecedenza.

Maybe I forgot to do something?