Xbox 360 error code 8015d002 is an error that may occur when you try to sign in to Xbox Live on your Xbox 360 console. It could mean that the two-step verification is turned on, but the password has not been set up.
Some of the common fixes include:
Please see our in-depth walk-through solutions below.
Solution 1. Check Email Verification
“Xbox 360 error code 8015d002” may occur if you haven’t confirmed the email verification for your Xbox Live account. Please check your email using your computer. If no email was found, check your spam.
Solution 2. Login to your Xbox Live account again
“Xbox 360 error code 8015d002” could be due to your Xbox Live or Microsoft account getting desynchronized with your Xbox 360. This is common when you use your account to log in to another Xbox console. Try to delete your account on your Xbox 360 and then reset your device.