EDIT (2022-03-14, 9.30 (UTC+0):
We have now contacted all players affected by this via an in-game message. Our apologies again for this issue and the inconvenience caused.

EDIT (2022-03-10, 13:00 UTC):
We identified the performance issue with our new database that had been causing the overload. We believe the situation is now stable, and have begun to slowly roll out rewards for the most recent Alliance War.

We are currently working to identify which players were unable to use their remaining War Energy due to Alliance Wars being disabled. Unfortunately, we will not be able to restore or otherwise modify any Alliance War results, ongoing Alliance Wars, or Path of Valor progression.

Our apologies once again for any inconvenience caused. Thank you for your patience!

Original message:
Unfortunately, we have discovered an issue with this feature and have decided to pause it for the time being. We will let you know when we can turn this feature back on.

Our sincere apologies for any inconvenience caused by this!