Adjust your voicemail settings
To change your voicemail settings, select Settings and more 
next to your profile picture at the top of Teams and then choose Settings > Calls.
In the Voicemail section, click Configure voicemail. That's where you'll find all your voicemail settings.
Voicemail greeting
To record a new voicemail greeting, select Record a greeting and follow the instructions to record your message.
Call answer rules
To change how calls are handled once they reach your voicemail, go to Call answer rules. By default, Teams will play your voicemail greeting and allow the caller to record a message. You have some other options, though:
Let the caller record a message.
Let the caller record a message or be transferred to someone else.
End the call without playing your greeting.
Play your greeting and end the call.
Transfer the call to someone else.
If you choose an option that includes transferring the call, set the name or number where you want your calls to go under Where should they be transferred?
Default greeting language
Change your default greeting language by selecting the language you want under Greeting language.
Text-to-speech voicemail greeting
To use a text-to-speech voicemail greeting, type one in Your custom greeting under Text-to-speech customized greeting.
Note: If you've recorded a greeting, it'll override the text-to-speech option.
Out of office voicemail greeting
Type your out of office greeting in Your custom out of office greeting under Text-to-speech customized greeting, then choose when you'd like it to play under Out of office greeting.
