Tricky apartment key fob copies frequency & code correctly but the copy doesn’t work – not a rolling fob

I have this key fob for our apartment building, and I want to make a copy of it.
I’ve taken it to 3 locksmiths who are able to create a copy, but the copies don’t work.
I’ve confirmed that it doesn’t appear to be a rolling fob by comparin… Continue reading Tricky apartment key fob copies frequency & code correctly but the copy doesn’t work – not a rolling fob