Except that that hyphen does not make much sense here, if you wanted to write it you'd pick Standardisierungsorganisation instead which gives you a very long wo

Except that that hyphen does not make much sense here, if you wanted to write it you'd pick Standardisierungsorganisation instead which gives you a very long word and matching that to ISO is just odd. In official government speech words don't tend to get that long, instead they get split into multiple ("Bundesministerium der Finanzen" instead of "Bundesfinanzministerium").