This article shows how to add a Teams Voice delegate - who can answer, and dial calls on your behalf.
Select the three dots ... next to the profile icon on the top-right of the screen and select Settings.
In the menu on the left, choose Calls.
Scroll down to Manage Delegates subheading.
Under Add a delegate, you may type in the names of your delegates. +
Once you have added them, you can check the boxes to adjust the settings.