LDAP with SSL on Omada controller gives "Fatal TLS error"

[seirdotexe]

Hello! I'm running openldap and I want to utilize it on my TP-Link Omada OC300 hardware controller. However I'm running into an issue I can't fix. Whenever I'm trying to test the LDAP connection on the Omada controller, I see an error on the terminal from openldap:

69640e0f conn=1106 fd=12 ACCEPT from IP=192.168.0.9:38680 (IP=0.0.0.0:636)
TLS: can't accept: A TLS fatal alert has been received..
69640e0f conn=1106 fd=12 closed (TLS negotiation failure)

My docker compose:

services:
  ldap:
    image: osixia/openldap:latest
    container_name: ldap
    environment:
      - LDAP_ORGANISATION=Thuis Lan
      - LDAP_DOMAIN=thuis.lan
      - LDAP_ADMIN_USERNAME=admin
      - LDAP_ADMIN_PASSWORD=secret
      - LDAP_BASE_DN=dc=thuis,dc=lan
      - LDAP_RFC2307BIS_SCHEMA=true
      - LDAP_TLS_VERIFY_CLIENT=try
    ports:
      - 636:636
    restart: unless-stopped

The LDAP settings on the Omada controller:

Is there something I could try beforehand reporting to TP-Link? Thanks in advance!