New
#11
Is your mother using a phone or PC for Outlook? (You said she had MS Authenticator on a phone.)
I don't think a phone can be entered as a trusted device:
I realize this doesn't help with your main question about why Outlook only asks for a password with MFA enabled.When you make your computer a trusted device, you won't need to enter a security code each time you try to access sensitive info, like credit card information associated with your Microsoft account.
Setting your computer to be a trusted device can be useful if you use it often, if you have two-step verification enabled, or if you're using the Microsoft Authenticator app to sign in.
Here's how to do it:
1. On the device you want to trust, go to the Security settings page and sign in to your Microsoft account.
2. You'll be prompted to verify your identity. Choose whether to receive the code through email, text, or an authenticator app. Once you have the code, enter it in the text box.
3. Select the check box for Don't ask me again on this device.
4. Select Verify.
Add a trusted device to your Microsoft account
Is she using an Outlook app or the Outlook.com web site?