Rich,
happens from time to time and in mostly it is caused by a (buggy) virus-definition update -or- the timestamp server itself (overload). What I always do in this case is to switch to another timestamp server.
Unfortunately, signcode only returns three values: 0 = success and 1 or 2 = failure.
In the next SetupBuilder 2023 build we have added a function to retrieve the human readable error text from system memory and display it in the compiler window.
Friedrich