My mojang account can Sign in my phone but my computer can't WHY???

This appears to be an account related issue and the bug tracker does not have access to the appropriate resources to help you with this problem. Instead, please contact Mojang Support in order to receive assistance, regarding your concern.

If you are able to sign in on your phone but not on your computer, then something on your computer is blocking the connection. Please visit Community Support to get help fixing the issue.