Gamers are reporting error 8015D002 when trying to log into Xbox Live. Additionally, this issue is similar to the one mentioned above, namely the inability to log into Xbox Live.
Gamers get an error message with a code when trying to log into Xbox Live:
Email and password didn’t work.
What is the cause of the Xbox email and password error 8015d002?
Xbox profile partially faulty: Many users have noticed that this particular error code may appear due to a profile error that affects the login process. If this scenario applies, you can solve the problem by moving the failed profile to a different type of storage before rebooting it.