Unable to Save Documents in Collabora Online - WOPI Token Error

Steps to reproduce

1. Open a document in Collabora Online through Nextcloud
2. Make changes to the document
3. Click the save button OR wait for auto-save
4. Observe that the "Last saved" timestamp doesn't update

Expected behavior

• Document should save when the save button is clicked
• Auto-save should work periodically
• "Last saved" timestamp should update to reflect successful saves

Actual behavior

• Clicking save button appears to do nothing
• Auto-save does not appear to function
• "Last saved" timestamp remains stale (e.g., shows "4 hours ago" despite recent save attempts)
• No error message is shown to users despite save failure

Other information

Host OS

Ubuntu 24.04 LTS

Output of sudo docker info

Client: Docker Engine - Community
 Version:    27.3.1
 Context:    default
 Debug Mode: false
 Plugins:
  buildx: Docker Buildx (Docker Inc.)
    Version:  v0.17.1
    Path:     /usr/libexec/docker/cli-plugins/docker-buildx
  compose: Docker Compose (Docker Inc.)
    Version:  v2.29.7
    Path:     /usr/libexec/docker/cli-plugins/docker-compose

Server:
 Containers: 9
  Running: 8
  Paused: 0
  Stopped: 1
 Images: 9
 Server Version: 27.3.1
 Storage Driver: overlay2
  Backing Filesystem: extfs
  Supports d_type: true
  Using metacopy: false
  Native Overlay Diff: true
  userxattr: false
 Logging Driver: json-file
 Cgroup Driver: systemd
 Cgroup Version: 2
 Plugins:
  Volume: local
  Network: bridge host ipvlan macvlan null overlay
  Log: awslogs fluentd gcplogs gelf journald json-file local splunk syslog
 Swarm: inactive
 Runtimes: io.containerd.runc.v2 runc
 Default Runtime: runc
 Init Binary: docker-init
 containerd version: 57f17b0a6295a39009d861b89e3b3b87b005ca27
 runc version: v1.1.14-0-g2c9f560
 init version: de40ad0
 Security Options:
  apparmor
  seccomp
   Profile: builtin
  cgroupns
 Kernel Version: 6.8.0-48-generic
 Operating System: Ubuntu 24.04 LTS
 OSType: linux
 Architecture: x86_64
 CPUs: 2
 Total Memory: 15.62GiB
 Name: dev-nextcloud2
 ID: b1272033-16a6-4940-83dd-78a68b54f4fd
 Docker Root Dir: /var/lib/docker
 Debug Mode: false
 Experimental: false
 Insecure Registries:
  127.0.0.0/8
 Live Restore Enabled: false

Docker run command or docker-compose file that you used

services:
  caddy:
    image: caddy:alpine
    restart: unless-stopped
    container_name: caddy
    volumes:
      - ./Caddyfile:/etc/caddy/Caddyfile
      - ./certs:/certs
      - ./config:/config
      - ./data:/data
      - ./sites:/srv
    network_mode: "host"

  nextcloud:
    image: nextcloud/all-in-one:latest
    restart: unless-stopped
    container_name: nextcloud-aio-mastercontainer
    ports:
      - "8080:8080"
    environment:
      - APACHE_PORT=11000
      - SKIP_DOMAIN_VALIDATION=true
      - NEXTCLOUD_MEMORY_LIMIT=1024M
    volumes:
      - nextcloud_aio_mastercontainer:/mnt/docker-aio-config
      - /var/run/docker.sock:/var/run/docker.sock:ro
    depends_on:
      - caddy
    deploy:
      resources:
        limits:
          memory: 16g

volumes:
  nextcloud_aio_mastercontainer:
    name: nextcloud_aio_mastercontainer

Other valuable info

Error Logs:

Error richdocuments
Time: Nov 19, 2024, 1:03:17 PM
UnknownTokenException Could not find token.
Failed to validate WOPI access during save

Request Details:
- Method: POST
- URL: /index.php/apps/richdocuments/wopi/files/1145_ocxnipeqsbfu/contents
- User Agent: COOLWSD HTTP Agent 24.04.9.1
- Version: 29.0.8.1

Start with the reported POST to /index.php/apps/richdocuments/wopi/files/1145_ocxnipeqsbfu/contents and the accompanying UnknownTokenException log. Review the supplied Docker Compose configuration and the Caddyfile used by the caddy service while reproducing the save attempt. Done means Collabora saves documents and auto-saves successfully, with the Last saved timestamp updating.