If you forgot your work or school password, never got a password from your organization, or have been locked out of your account, you can use your security info and your mobile device to reset your work or school password.
If you have registered MFA methods previously, those will automatically be registered as Password Reset Methods.
Note: Users will be prompted to set this up on first login following October 25th if no methods are already configured.
Set up your password reset verification method manually
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Open the web browser on your device and go to the Security info page.
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The Following options are available to register. Select "Add Sign-In Method" and choose one of these options to register.
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After you select and set up your methods, choose Finish to complete the process.
Reference and more information: https://support.microsoft.com/en-us/account-billing/register-the-password-reset-verification-method-for-a-work-or-school-account-47a55d4a-05b0-4f67-9a63-f39a43dbe20a
Registration during login process
If you are required to have Multi-Factor Authentication (MFA) enabled, you will be prompted on login to set up those methods.
1. Navigate to Office.com or any other Microsoft login screen. Hit Sign in.

2. Enter your E-Mail address in the E-Mail address field.

3. Enter your Password

4. You will be prompted for "More Information Required". This means that you are required to configure MFA. Hit Next

3. You will be prompted to set up the Microsoft Authenticator app. If you'd prefer to set up a different method, click "I want to set up a different method" on the bottom. Otherwise, hit next.

4. Hit Next until you are prompted with a QR Code. Scan this with your authenticator app. Note: You will need the Microsoft Authenticator app for this method. It is available from the IOS or Google Store.

5. Enter the number code to match the code shown on the screen. Then, that method is registered.
If you are using a Phone number instead
1. Select the "I want to use a different method" on the bottom of the Authenticator setup screen.

2. Enter your Phone number in the phone number box.

3. Select "Receive a Code" for a text message or "Call me" for a phone call. Then Hit Next.
4. Enter the Code recieved via text. Or hit # after answering the Microsoft phone call. Then, that method is registered.