Collabora - document loading failed

I have an unraid system and have nextcloud and collabora on the docker container but I can’t get it to work.

Unraid version: 6.11.5
Nextcloud: 25.0.3 (LSIO image)
Collabora: (collabora/code)
Nextcloud office(richdocuments): 7.1.0

Collabora on local access( with prompt username and password)

Collabora public access (no username and password prompt) - using nginx proxy manager + cloudflared
collabora public

On nextcloud office it has green check mark:

When I open a document (on either local or public domain of my nextcloud instance)

Did I miss some configuration? Does it work on your end?

please review this article and follow the troubleshooting steps:

Nextcloud Collabora integration