The default code should be on a sticker inside the back panel unless you removed it… or that same sticker exists on the back page of the instruction manual that came with your lock… but once factory reset changing back to your preferred code (using the manual methods provided in the manual) should not affect your zwave troubleshooting as long as the “programming code” remains the same…
You said it is not “found” by the integrations… so you attempted a secure inclusion and it was not found? Looking at the logs while attempting to pair are usually helpful to let you figure out what is going on. Also it has recently been suggested in a few posts that people have had to have have the lock quite close to their sticks. My personal suggestion would be to put brand new batteries in regardless how good you think they are as that caused issues for me…
Also don’t bother with OpenZwave if you are currently setting up a new system… either use Z-waveJS or Zwavejs2mqtt… have successfully included any zwave devices to this stick?
Edit; here is a recent thread with some pertinent information Schlage / Allegion BE469 Z-Wave lock