by: adminPosted on: November 16, 2021 the proxy defaults to searching the userPrincipalName attribute for a match. If username_attribute is set to an LDAP attribute other than userPrincipalName whose values contain the @ symbol (such as mail) HTTP & SOCKS Rotating & Static Proxy 72 million IPs for all purposes Worldwide locations 3 day moneyback guarantee Visit brightdata.com Frequently Asked Questions about If a user logs in with a username containing an @ symbol