。
That speaker couldn't get anyone to listen.
Literal
That speaker [topic-は] talk [object-を] listen [benefactive-て] receive-could-not.
~てもらえなかった is the negative potential past of ~てもらう ('to receive the favor of someone doing X'). The speaker couldn't obtain the favor of being listened to. This stacks the benefactive frame, potential, negative, and past tense — a good example of how Japanese auxiliary verbs layer meaning.