These errors are all related to our account services system.
As part of our routine monitoring, we discovered a list of email addresses and passwords posted online. While the list is not related to Epic Games, your email address may have been on the list. Since many people reuse their passwords on multiple websites, we are resetting your Epic account password as a precautionary measure.
Please check your email for a message to reset your Epic account password. If you do not see this email, please contact support.
If you are receiving error AS-18031, please see here. For error AS-18004, please see here.
For any other error, please contact Player Support for assistance using the Email Us button on the sidebar of this page. In your email, make sure to include your dxdiag and launcher debug logs.