Step 1: From the desktop Teams app:
Sign out of Teams
Sign in to a different account, "Use another account or sign up"
Step 2: Use email: "[email protected]"
Use username: "xxx.Main"
Use password: "will be provided"
Step 3: This should have you signed into the account now
From here, you will need to make sure you have a headset connected to your computer, or a very quiet room.
At the top, near the avatar, select the "...", and then choose "Settings"
Step 4: On the left, choose "Calls"
Step 5: Towards the middle of the page, choose "Configure voicemail"
Step 6: From here, you should have access to follow menu prompts to re-record the greeting
Once you've updated the account, sign out
You should now have the option to sign into either your personal account or the "109.Main" account for future changes