The following LDAP filter is currently refused as it contains Braces :

(&(UFRCodeComposante=*)(|(UFRsourceReferentiel={SIHAM})(uid=rabelais)(ufrgroupe=cn=Acces_Intranet,ou=groups,dc=univ-tours,dc=fr))) 

In LDAP syntax, braces are allowed on attributes excepted on userid

See : https://documentation.avaya.com/fr-FR/bundle/AdministeringAvayaDeviceServices_R8.1.4/page/Supported_characters_for_LDAP_attributes.html