Element Call Failing - No Audio/Video, "Waiting for Media" on Mobile

[glycerinevaseline]

Playbook Configuration:

My vars.yml file looks like this:

exim_relay_enabled: false
#matrix_coturn_enabled: false
matrix_element_call_enabled: true

matrix_synapse_admin_enabled: true
matrix_synapse_enable_registration: true
matrix_synapse_enable_registration_without_verification: true
matrix_synapse_registration_requires_token: true

matrix_synapse_auto_compressor_enabled: true
matrix_synapse_auto_compressor_schedule: "*-*-* 00:00:00"
matrix_synapse_auto_join_rooms: ["#welcome:redacted.url"]
matrix_synapse_auto_accept_invites_enabled: true

matrix_synapse_log_level: "INFO"
matrix_synapse_storage_sql_log_level: "INFO"
matrix_synapse_root_log_level: "INFO"

matrix_synapse_workers_enabled: true
matrix_synapse_workers_preset: one-of-each
matrix_static_files_container_labels_base_domain_enabled: true    

Matrix Server:

• OS: [Debian 12]
• Architecture [amd64]

Ansible:

ansible [core 2.14.18]
  config file = /home/user/matrix-docker-ansible-deploy/ansible.cfg
  configured module search path = ['/home/user/.ansible/plugins/modules', '/usr/share/ansible/plugins/modules']
  ansible python module location = /usr/lib/python3/dist-packages/ansible
  ansible collection location = /home/user/.ansible/collections:/usr/share/ansible/collections
  executable location = /usr/bin/ansible
  python version = 3.11.2 (main, Nov 30 2024, 21:22:50) [GCC 12.2.0] (/usr/bin/python3)
  jinja version = 3.1.2
  libyaml = True

Problem description:

When initiating a call (voice or video) via Element Web, the UI shows no participants joining, and no audio/video is transmitted. On Element X (Android/iOS), the call interface remains stuck at "Waiting for media".

Initially suspected missing Coturn (TURN server), but the issue persists after enabling Coturn.

Additional context

log of matrix-livekit-jwt-service.service

Mar 24 20:13:00 [] matrix-livekit-jwt-service[40418]: 2025/03/25 00:13:00 Request from redacted.ip:port at "https://call.element.redacted.url"
Mar 24 20:13:00 redacted matrix-livekit-jwt-service[40418]: 2025/03/25 00:13:00 Request from redacted.ip:port at "https://call.element.redacted.url"
Mar 24 20:13:00 redacted matrix-livekit-jwt-service[40418]: 2025/03/25 00:13:00 Failed to look up user info: Get "matrix://redacted.url/_matrix/federation/v1/openid/userinfo?access_token=redacted": dial tcp: lookup redacted.url on 127.0.0.11:53: no such host

ufw status

22/tcp                     ALLOW       Anywhere                  
80/tcp                     ALLOW       Anywhere                  
443/tcp                    ALLOW       Anywhere                  
443/udp                    ALLOW       Anywhere                  
8448/tcp                   ALLOW       Anywhere                  
8448/udp                   ALLOW       Anywhere                  
7881/tcp                   ALLOW       Anywhere                  
7882/udp                   ALLOW       Anywhere                  
3478/tcp                   ALLOW       Anywhere                  
3478/udp                   ALLOW       Anywhere                  
5349/tcp                   ALLOW       Anywhere                  
5349/udp                   ALLOW       Anywhere                  
49152:49172/udp            ALLOW       Anywhere 

I’d be happy to share sanitized configs/logs if needed. Thanks in advance for your expertise! 🙏