legacy element android and ios use the unspecced/invalid "user" field instead of identifier for UIAA. this has broken at least password resets[1] [1]: https://github.com/element-hq/element-android/issues/8043 [2]: https://github.com/element-hq/element-ios/issues/7405 Signed-off-by: strawberry <strawberry@puppygock.gay>