Assign or change an emergency address for a user
When you are setting up Calling Plans in Office 365, you will need to assign a phone number and emergency address to each of your users. The emergency address must be created before you can associate it with a phone number. See What are emergency locations, addresses and call routing? for more information.
Want to know how to get Calling Plans in Office 365 and how much they cost, see Skype for Business and Microsoft Teams add-on licensing.
Assign or change an emergency address
Sign in to Office 365 with your work or school account.
Go to the Office 365 admin center > Skype for Business.
In the left navigation go to Voice, then click Voice users.
For you to see the Voice option in the left navigation in the Skype for Business admin center, you must first buy at least one Enterprise E5 license, one Phone System add-on license, or one Audio Conferencing add-on license.
On the Voice users page, locate and select the user you want to change the emergency address for.
In the Action pane, under Emergency location, click Change.
You can only change an emergency address that has already been validated. To change an emergency address that hasn't been validated, delete it and create another emergency address.
On the Assign number page, click Change location.
Under Change emergency address to, enter the name of the city and click Search.
Select the emergency address from the address drop-down list, and then click Save.