Thanks for your reports guys. We are currently looking into this.
If there are any other examples of Error Code 3.0 please post your Ally Code.
We checked the accounts you provided and none of them seem to have any issues:
7vx_7fQIQ6eqE2Gao-yBYQ is a level 85 account which has activity showing up today.
695 - 483 - 925 is for a level 1 account.
For everyone else who posted their Ally Codes here, you should be able to login now. We will also review your accounts for what you missed out on due to this issue and you will receive a separate inbox message for that.
Thank you for your patience and apologies for the inconvenience caused.