Upload mp3 for teams voice voicemail

Dear @Felicia Leflar,

Thank you for reaching out to the Microsoft Q&A community. This is a common point of confusion, and I'm happy to provide a clear, step-by-step guide. 

After a review of the administrator functions, I must clarify that it is not currently possible for an admin to upload an MP3 or other audio file to set a user's personal voicemail greeting. That function is limited to users recording their own greeting through the Teams client. 

The Import-CsOnlineAudioFile cmdlet, which is often referenced for audio uploads, is only for services like Auto Attendants and Call Queues, not for individual user mailboxes. 

As an administrator, the only way you can centrally set a user's greeting is by using PowerShell to set a Text-to-Speech message. This will override the default system greeting, but it will not override a greeting personally recorded by the user. 

Here is the step-by-step PowerShell code to accomplish this. 

Step 1: Connect to Microsoft Teams PowerShell 

First, you must connect to your tenant. If you don't have the module, run Install-Module MicrosoftTeams first. 

Install-Module -Name MicrosoftTeams
Connect-MicrosoftTeams

You will be prompted to sign in with your admin credentials. 

Step 2: Set the Text-to-Speech Greeting for a User 

Use the Set-CsOnlineVoicemailUserSettings cmdlet to set the greeting. 

• Replace "******@yourdomain.com" with the user's email or UPN.
• Replace the text in -DefaultGreetingPromptOverwrite with your desired message.

$UserUPN = "******@yourdomain.com" 
$GreetingMessage = "You have reached the voicemail of XXX. Please leave your name, number, and a brief message." 

# Apply the new greeting 
Set-CsOnlineVoicemailUserSettings -Identity ******@yourdomain.com -DefaultGreetingPromptOverwrite  "You have reached the voicemail of XXX. Please leave your name, number, and a brief message." 
Write-Host "Voicemail greeting has been set for ******@yourdomain.com"  

To summarize, you can use the Set-CsOnlineVoicemailUserSettings cmdlet to set a text-based greeting, but not to upload an audio file for a specific user. 

For more details on all available settings for this cmdlet, please see the official Microsoft documentation: Set-CsOnlineVoicemailUserSettings (MicrosoftTeams) | Microsoft Learn 

For a visual guide on how users can configure their own voicemail settings within the Teams client, this video may be useful: Configure and access your voicemail in Microsoft Teams. 

I hope this clarifies what is possible and provides a helpful alternative. 

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