The Voiceless Voice Actor is a request in Tokyo Mirage Sessions #FE Encore for the Nintendo Switch. It is available after Chapter 2.
The Voiceless Voice Actor Guide
To start the request talk to Ayaha in Fortuna HQ. She will tell you that a Voice Actor is feeling down and that you should talk to her.
Daitama
Talk to the person in the lower left of Daitama and to find out that the Voice Actor is not motivated at all and doubts herself. Report to Ayaha in Fortuna HQ and she will send you inside Illusory Daitama to find the Mirage responsible for it.
Go inside Illusory Daitama and follow the path. After using the elevator to go to the lower level and pass the Masked Salesclerk you can see a burning Mirage on the right. Defeat the Mirage and talk to the Voice Actor. Return to Ayaha in Fortuna HQ to receive the reward Clap Track.