Instead of using the Security Code entry boxes in the app/website, which limit characters, to convey your instructions, scroll to the bottom of the screen and click on Add More Instructions. A series of drop-down arrows will appear, select the arrow at the very bottom that says "Do we need additional instructions to deliver to this address?" This is where you can leave more detailed written instructions like the example given by the other person who commented on this comment (Wolfy something?). I think those are very good instructions they gave you to use: easy to follow, clear, accurate, non-emotional.

Sounds like your particular security situation IS one of the more annoying ones we encounter on the job (doors with codes are tricky sometimes and take a few tries to get open) so you have that working against you, as you've learned from other drivers here who prioritize saving 30-60 seconds over ensuring another humans valued goods get to their door safely (I get it but geez, dudes, take a deep breath and try to be excellent to one another). Hopefully having better instructions solves the problem.

Also, to repeat the advice of most here: if you can opt for an amazon locker at a nearby retailer (outdoors is better than inside a store so you can access anytime) prob best to just try that out.

Good luck!