Visual Voicemail Transcription Problem Solved Apple iPhone - Enable "Hey Siri"
Hey Siri has to be enabled and in use for the transcription of the voicemail.
iPhone X - My visual voicemail stopped working a few weeks ago. I've spent hours on the phone with AT&T Tech Support. After they completely erased all of my voicemails and reset everything, it still did not work properly. After calling Apple and trying several things, the transcriptions appeared after enabling "Hey Siri".