For the new feature "Global name/password pairs", it seems the parameters cannot be accessed in a build step unless the check box "Mask passwords" is selected.
I think this should not be required. It is also confusing to the user, because the check box is labeled "Mask passwords", and the help says
"When enabled, allows masking passwords that may appear in the console."

But for global name/password pairs this check box has an additional functionality.
If think global parameters should always be accessible per default. Currently, for global passwords this is not the case.