Xbox 360: Error message when you try to sign up for Xbox Live: "Xbox Live sign up is currently unavailable. Please try again later" (912278)

CAUSE

You receive this error message if one of the following conditions is true:

You are trying to migrate a two-month trial account from an original Xbox console and the account is not yet a paid account.
The account that you are trying to migrate from an original Xbox console to an Xbox 360 console has been canceled.
The account that you are trying to migrate from an original Xbox console to an Xbox 360 console is not in good standing. For example, the credit card that you used for the account has expired.
The account from the original Xbox console requires action. For example, your gamertag is currently banned or you have not yet complied with an outstanding forced gamertag.

Try the solution that best relates to the issue that you are experiencing. Select one of the following solutions:
1. If you are using a two-month trial account on the original Xbox console, wait until the trial period is over and the account is a paid subscription before you migrate the account.
2. If your account has been canceled on the original Xbox console, create a new account on the Xbox 360 console.
3. If your account on the original Xbox console is not in good standing, you may not be able to play a game on an original Xbox console. Try to use your account on the original Xbox console. If you cannot play a game or if you cannot access account management, you may have to update your credit card information in the Xbox Dashboard.
4. If you have unread system messages because of a banned gamertag or because of a forced gamertag change, make sure that you read these messages, and then wait until the gamertag is changed or until the ban period is over before you migrate your account to Xbox 360.