User's data don't SYNC through LDAP

Description:

LDAP data don't SYNC to RocketChat database
LDAP connection works as expected
LDAP users search works as expected with field 'Search field' -> 'uid'

Steps to reproduce:

1. Goto 'Settings -> LDAP -> Data sync'
2. Put 'uid' into 'Unique Identifier Field' field
3. Press 'Save changes' and 'Sync now'

Expected behavior:

All users from LDAP database copied into RockerChat Users database

Server Setup Information:

• Version of Rocket.Chat Server: 5.0.2/5.0.3/5.0.4
• Operating System: Linux ... 5.17.12-300.fc36.x86_64
• Deployment Method: Docker Compose
• Number of Running Instances: 1
• DB Replicaset Oplog: MongoDB 4.4
• MongoDB Version: 4.4

Relevant logs:

Logs from server container after 'TestLDAP search' pressed (user found well)

{"level":30,"time":"2022-08-22T09:40:42.495Z","pid":1,"hostname":"0c54281d2887","name":"LDAP","section":"Connection","msg":"Connecting","url":"ldaps://<noname_host>:636"}
{"level":20,"time":"2022-08-22T09:40:42.495Z","pid":1,"hostname":"0c54281d2887","name":"LDAP","section":"Connection","msg":"clientOptions","clientOptions":{"url":"ldaps://<noname_host>:636","timeout":60000,"connectTimeout":1000,"idleTimeout":1000,"reconnect":true,"log":{},"tlsOptions":{"rejectUnauthorized":false}}}
{"level":30,"time":"2022-08-22T09:40:42.612Z","pid":1,"hostname":"0c54281d2887","name":"LDAP","section":"Connection","msg":"LDAP connected"}
{"level":20,"time":"2022-08-22T09:40:42.612Z","pid":1,"hostname":"0c54281d2887","name":"LDAP","section":"Connection","clazz":"Client","ldap_id":"21__ldaps://<noname_host>:636","msg":"connected after 1 attempt(s) %j"}
{"level":30,"time":"2022-08-22T09:40:42.613Z","pid":1,"hostname":"0c54281d2887","name":"LDAP","section":"Search","msg":"Searching by username","username":"<noname_user>","baseDN":"cn=users,cn=accounts,dc=ipa","searchOptions":{"filter":"(&(objectclass=)(uid=<noname_user>))","scope":"sub","sizeLimit":1000,"attributes":["","+"],"paged":{"pageSize":250,"pagePause":false}}}
{"level":30,"time":"2022-08-22T09:40:42.614Z","pid":1,"hostname":"0c54281d2887","name":"LDAP","section":"Bind","msg":"Binding UserDN","userDN":"uid=admin,cn=users,cn=accounts,dc=ipa"}
{"level":20,"time":"2022-08-22T09:40:42.655Z","pid":1,"hostname":"0c54281d2887","name":"LDAP","section":"Search","msg":"searchOptions","searchOptions":{"filter":"(&(objectclass=)(uid=<noname_user>))","scope":"sub","sizeLimit":1000,"attributes":["","+"],"paged":{"pageSize":250,"pagePause":false}},"baseDN":"cn=users,cn=accounts,dc=ipa"}
{"level":20,"time":"2022-08-22T09:40:43.114Z","pid":1,"hostname":"0c54281d2887","name":"LDAP","section":"Mapping","msg":"Extracted Attribute","key":"dn","type":"string","value":"uid=<noname_user>,cn=users,cn=accounts,dc=ipa"}
...
{"level":20,"time":"2022-08-22T09:40:43.115Z","pid":1,"hostname":"0c54281d2887","name":"LDAP","section":"Mapping","msg":"Extracted Attribute","key":"uid","type":"string","value":"<noname_user>"}
...

Logs from server container after 'Sync Now' pressed:

{"level":35,"time":"2022-08-22T09:36:05.790Z","pid":1,"hostname":"0c54281d2887","name":"API","method":"POST","url":"/api/v1/method.call/license%3AgetModules","userId":"YQ5ExFNyJpFNxgDbT","userAgent":"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.0.0 Safari/537.36","length":"96","host":"127.0.0.1:3333","referer":"https://<noname_host>/admin/settings/LDAP","remoteIP":"192.168.32.1","status":200,"responseTime":30}
{"level":35,"time":"2022-08-22T09:36:06.131Z","pid":1,"hostname":"0c54281d2887","name":"API","method":"GET","url":"/api/v1/licenses.get","userId":"YQ5ExFNyJpFNxgDbT","userAgent":"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.0.0 Safari/537.36","host":"127.0.0.1:3333","referer":"https://<noname_host>/admin/settings/LDAP","remoteIP":"192.168.32.1","status":200,"responseTime":410}
{"level":35,"time":"2022-08-22T09:36:06.136Z","pid":1,"hostname":"0c54281d2887","name":"API","method":"GET","url":"/api/v1/licenses.isEnterprise","userId":"YQ5ExFNyJpFNxgDbT","userAgent":"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.0.0 Safari/537.36","host":"127.0.0.1:3333","referer":"https://<noname_host>/admin/settings/LDAP","remoteIP":"192.168.32.1","status":200,"responseTime":620}
{"level":35,"time":"2022-08-22T09:36:06.153Z","pid":1,"hostname":"0c54281d2887","name":"API","method":"GET","url":"/api/v1/cloud.registrationStatus","userId":"YQ5ExFNyJpFNxgDbT","userAgent":"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.0.0 Safari/537.36","host":"127.0.0.1:3333","referer":"https://<noname_host>/admin/settings/LDAP","remoteIP":"192.168.32.1","status":200,"responseTime":360}
{"level":35,"time":"2022-08-22T09:36:06.166Z","pid":1,"hostname":"0c54281d2887","name":"API","method":"POST","url":"/api/v1/ldap.syncNow","userId":"YQ5ExFNyJpFNxgDbT","userAgent":"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.0.0 Safari/537.36","length":"0","host":"127.0.0.1:3333","referer":"https://<noname_host>/admin/settings/LDAP","remoteIP":"192.168.32.1","status":200,"responseTime":4}

Start with the LDAP Data sync settings and the /api/v1/ldap.syncNow entry point shown in the logs. Reproduce the issue with uid as the Unique Identifier Field and trace why Sync Now does not copy LDAP users into the Rocket.Chat users database; done means the expected users are created or updated.