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PM 861 Backup Failure

Hello,

We are facing an issue with the backup unit of a PM861 controller.

All the procedure about configuring the bakup unit has been done and on a lab enviroment it works. However when installing the controllers on site the redundant controller does not work. Fault led flashes quickly and stop flashes quickly and stop. This indicates firmware downlod or another error to check in the log. I checked the log and the errors that I could found are about redundancy and module bus. The last one makes sense because in the lab it works hoever on field where we have other modules it fails. How ever I cannot see what actually is wrong. I attached the only log that has information and a picture of the controllers. Cables and connection phisically checked and changed (just in case).

Any help will be grateful.