Einstein Conversation Insights (ECI) Does Not Support Inbound Voicemails in Salesforce Voice

After an agent receives an inbound voicemail in Salesforce Voice, the Einstein Conversation Insights (ECI) transcript tab on the VoiceCall record does not load, even when the agent has valid ECI permission sets assigned. The behavior differs based on how the voicemail was delivered:

Queue-routed or Omni-Channel flow voicemails: The ECI transcript tab displays: "No Transcript. We haven't received the call transcript from the provider. Check back later, and reach out to your Salesforce admin if the issue persists."

Direct-to-rep voicemails: The VoiceCall record displays: "We're processing this call for insights. They should be ready soon." And the transcript tab displays: "No Transcript. We haven't received the call transcript from the provider. Check back later, and reach out to your Salesforce admin if the issue persists."

Neither scenario completes regardless of how long you wait.