Modifying the "Unique Identifier Field" parameter for LDAP

[Max-ADC]

Hello,

I have been using rocket.chat with ldap connection since 3 years. Every thing is working great. But now I need to modify the "Unique Identifier Field" value for the LDAP sync. Since the first config of Rocketchat, it was set to "sAMAccountName", but I need to change it to accomodate some evolutions in our LDAP directory.
I have try to change it to "mail" but we cannot connect anymore. I am getting the following error :

{"level":50,"time":"2025-04-28T14:40:22.101Z","pid":93659,"hostname":"[MY SERVER NAME]","name":"Data Importer - LDAPUserConverter","err":{"type":"errorClass","message":"Username already exists. [403]","stack":"Error: Username already exists. [403]
at AccountsServer.insertUserDoc (packages/accounts-base/accounts_server.js:1225:15)
at processTicksAndRejections (node:internal/process/task_queues:105:5)
at AccountsServer.Accounts.insertUserDoc (app/authentication/server/startup/index.js:323:14)
at LDAPUserConverter.insertOrUpdateUser (app/importer/server/classes/converters/UserConverter.ts:241:19)
at LDAPUserConverter.convertRecord (app/importer/server/classes/converters/UserConverter.ts:53:3)
at LDAPUserConverter.iterateRecords (app/importer/server/classes/converters/RecordConverter.ts:219:19)
at LDAPUserConverter.convertData (app/importer/server/classes/converters/UserConverter.ts:64:4)
at Function.convertSingleUser (server/lib/ldap/UserConverter.ts:51:3)
at Function.syncUserForLogin (server/lib/ldap/Manager.ts:365:3)
at Function.addLdapUser (server/lib/ldap/Manager.ts:284:16)
at Function.login (server/lib/ldap/Manager.ts:53:11)
at packages/accounts-base/accounts_server.js:593:9
at tryLoginMethod (packages/accounts-base/accounts_server.js:1560:14)
at AccountsServer._runLoginHandlers (packages/accounts-base/accounts_server.js:592:22)
at AccountsServer.Accounts._runLoginHandlers (app/lib/server/lib/loginErrorMessageOverride.ts:9:17)
at MethodInvocation.methods.login (packages/accounts-base/accounts_server.js:654:22)","isClientSafe":true,"error":403,"reason":"Username already exists.","errorType":"Meteor.Error"},"msg":"Username already exists. [403]"}

Is it possible to modify this parameter without having to recreate all my users ?

Thank you in advance