• Open a browser and type in portal.office.com
• Put in your email address: user@domain.com
• Use the password that you normally use to sign into your pc or email.
• If you see the last two digits of your desk or cell number verification has already been set up.
• If you see this:

• Click Next and choose Authentication Phone
• Select United States in the country / region field
• Enter your the number you want to receive call-backs on, your desk or cell phone.

• Click Next and you will receive a call.  Press the # key when prompted.