Configuration attached (I've anonymized sensitive information).
Please note that this is the config with EnvInject 1.0 and Jenkins 1.456 (i.e. the configuration that resolves the variable). Here's an excerpt from the log that shows the variable being successfully injected:
[EnvInject] - Injecting as environment variables the properties content
If I now upgrade to EnvInject 1.40, the log says something along the lines of "not injecting unresolved variable". Note that during upgrade/downgrade I lose the EnvInject step for 100+ jobs, so I'd rather try to avoid going through the repro unless you really need me to