Hey @michizubi-SRF, 
Thanks for the detailed description and logs — it’s clear you’re running a proper Kubernetes/OpenShift setup.
To use the editors in a cluster environment like this, you need a valid license for ONLYOFFICE Docs Enterprise Edition or Developer Edition. The community (free) version is intended for smaller-scale usage (up to ~20 simultaneous connections) and is not officially supported for Kubernetes clusters.
If you already have an Enterprise/Developer license, I strongly recommend contacting the official support team directly — they can help you troubleshoot the issue.
You can reach them here:
https://www.onlyoffice.com/support-contact-form
Let me know if you have a license and I can point you to the right support channel again. Otherwise, feel free to ask anything else!