Unable to implement LDAP authentication for Grafana

Hello Team,
We have installed Grafana-Loki using Helm Chart (version 2.10.1), and it works fine.
While upgrading the chart to implement LDAP authentication, by updating values as below, it gives an error. Can you please help triage this error?

grafana:
  enabled: true
  logLevel: debug
  adminPassword: <REDACTED>  # Change this to a secure password
  ldap:
    enabled: true
    existingSecret: grafana-ldap
2024-03-26T12:24:40.500973396-06:00 t=2024-03-26T18:24:40+0000 lvl=eror msg="Invalid username or password" logger=context userId=0 orgId=0 uname= error="user not found" remote_addr=10.42.2.0
2024-03-26T12:24:40.501001149-06:00 t=2024-03-26T18:24:40+0000 lvl=info msg="Request Completed" logger=context userId=0 orgId=0 uname= method=POST path=/login status=401 remote_addr=10.42.2.0 time_ms=0 size=42 referer=https://grafana.<REDACTED>/login
2024-03-26T12:24:46.704987434-06:00 t=2024-03-26T18:24:46+0000 lvl=eror msg="Invalid username or password" logger=context userId=0 orgId=0 uname= error="user not found" remote_addr=10.42.2.0
2024-03-26T12:24:46.705012136-06:00 t=2024-03-26T18:24:46+0000 lvl=info msg="Request Completed" logger=context userId=0 orgId=0 uname= method=POST path=/login status=401 remote_addr=10.42.2.0 time_ms=0 size=42 referer=https://grafana.<REDACTED>/login

BTW, with the same config updated in ldap.toml (grafana-ldap secret), it is able to find the users in LDAP.

Please help.

Team, please check above issue.

Can anyone shed some light on enabling LDAP authentication for Grafana.

Team, can anyone please help us with LDAP integration