[EDIT 11 April] When the Wars and the Raid Tournaments were running at the same time, it exposed a bug in our code that caused the client to go out of sync with the server. The bug had been there for months without causing issues, but now it would appear in certain edge cases. While we did test running Wars and Raid Tournaments at the same time, we were unfortunately unable to encounter this in our testing.
The Alliance War is cancelled due to an unexpected conflict with the Raid Tournament.
We are aware of the issue where some players are not able to login or have problems with the current Alliance War.
We are still investigating this issue. We will announce here when we know more about this.
Our sincere apologies for this!