Having trouble with user authentification LDAP on Yunohost adding an existing user not included in LDAP to Yunohost LDAP

I am not sure is a problem, but it seems not ver clean… Can I let it like this ? What’s the meaning of On collisions a random number (between 1000 and 9999) will be attached to the retrieved value. For example, if “alice” exists, the next username may be “alice_1337”.
Can I consider it is not a problem and let it like this ?

I also made a topic on Yunohost forum (in french): Problème LDAP après ajout au sso de yunohost d'utilisateurs déjà enregistrés dans Nextcloud avec Registration - #3 by rodinux - Apps - YunoHost Forum