Häfele Dialock / Key Cutter integration troubleshooting

Hello!

We have recently started using the Integration to program keycards directly from MEWS. 
We are using version 1.1.36.0 of the Dialock KeyWriter.

Unfortunately, seemingly at random, some of the programmed keys are not working i.e. the command is sent to the encoder and one card works while another card does not even though both keys were programmed together by the same command coming from MEWS.
We are already in contact with Häfele support and have opened tickets with MEWS previously.
We are in the process of trying to figure out the pattern and analyzing the error codes the locks/keys are producing.
I know this is a shot in the dark and probably a pretty niche issue but it can’t hurt to ask and try using all possible avenues for finding a solution.
Does anyone have experience in the setup of the integration or has anyone here run into this issue and was able to resolve it? If so we would be immensly grateful for any support or suggestions.

Thank you very much