打診 だしん発生 はっせい げん認証 にんしょうではありませんでした
dashinhasseigennin shōdewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 打診発生源認証

1. Was not a source authentication proposal.; Was not a preliminary inquiry regarding the source.

Past/Perfective
Negative
Polite
Formal Register
Computing