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:
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On the device you want to trust, go to the Security settings page and sign in to your Microsoft account.
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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.
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Select the check box for Don't ask me again on this device.
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Select Verify.
You can now sign in and edit your info on this device whenever you want, without entering another security code.