There are many issues in your system:
- from the log it looks your haproxy talks to only one backend nx01 but there are still 401/412 error codes - at least in this snippet it happens for PUT method - maybe your backend is not setup correct. There are many 404 error on nxoos - which is not good as well.
- your NC *can not connect with your CODE server (likely because of TLS issue).
I would recommend you start with basic single-node setup without haproxy, make it work according to Collabora integration guide