diff --git a/bindings/matrix-sdk-ffi/src/api.udl b/bindings/matrix-sdk-ffi/src/api.udl
index 03f242154..bdb95afcf 100644
--- a/bindings/matrix-sdk-ffi/src/api.udl
+++ b/bindings/matrix-sdk-ffi/src/api.udl
@@ -164,7 +164,7 @@ interface Client {
 
     [Throws=ClientError]
     string display_name();
-    
+
     [Throws=ClientError]
     void set_display_name(string name);
 
@@ -179,7 +179,7 @@ interface Client {
 
     [Throws=ClientError]
     void set_account_data(string event_type, string content);
-    
+
     [Throws=ClientError]
     string upload_media(string mime_type, sequence<u8> content);
 
@@ -295,24 +295,8 @@ interface MediaSource {
     string url();
 };
 
-[Error]
-enum AuthenticationError {
-    "ClientMissing",
-    "SessionMissing",
-    "Generic",
-};
-
 interface AuthenticationService {
     constructor(string base_path);
-
-    [Throws=AuthenticationError]
-    void configure_homeserver(string server_name);
-
-    [Throws=AuthenticationError]
-    Client login(string username, string password, string? initial_device_name, string? device_id);
-
-    [Throws=AuthenticationError]
-    Client restore_with_access_token(string token, string device_id);
 };
 
 interface SessionVerificationEmoji {};
diff --git a/bindings/matrix-sdk-ffi/src/authentication_service.rs b/bindings/matrix-sdk-ffi/src/authentication_service.rs
index bef5a7f7b..b9687f828 100644
--- a/bindings/matrix-sdk-ffi/src/authentication_service.rs
+++ b/bindings/matrix-sdk-ffi/src/authentication_service.rs
@@ -14,7 +14,8 @@ pub struct AuthenticationService {
     homeserver_details: RwLock<Option<Arc<HomeserverLoginDetails>>>,
 }
 
-#[derive(Debug, thiserror::Error)]
+#[derive(Debug, thiserror::Error, uniffi::Error)]
+#[uniffi(flat_error)]
 pub enum AuthenticationError {
     #[error("A successful call to use_server must be made first.")]
     ClientMissing,
@@ -56,13 +57,6 @@ impl HomeserverLoginDetails {
     }
 }
 
-#[uniffi::export]
-impl AuthenticationService {
-    pub fn homeserver_details(&self) -> Option<Arc<HomeserverLoginDetails>> {
-        self.homeserver_details.read().unwrap().clone()
-    }
-}
-
 impl AuthenticationService {
     /// Creates a new service to authenticate a user with.
     pub fn new(base_path: String) -> Self {
@@ -73,6 +67,32 @@ impl AuthenticationService {
         }
     }
 
+    /// Get the homeserver login details from a client.
+    async fn details_from_client(
+        &self,
+        client: &Arc<Client>,
+    ) -> Result<HomeserverLoginDetails, AuthenticationError> {
+        let login_details = join3(
+            client.async_homeserver(),
+            client.authentication_issuer(),
+            client.supports_password_login(),
+        )
+        .await;
+
+        let url = login_details.0;
+        let authentication_issuer = login_details.1;
+        let supports_password_login = login_details.2.map_err(AuthenticationError::from)?;
+
+        Ok(HomeserverLoginDetails { url, authentication_issuer, supports_password_login })
+    }
+}
+
+#[uniffi::export]
+impl AuthenticationService {
+    pub fn homeserver_details(&self) -> Option<Arc<HomeserverLoginDetails>> {
+        self.homeserver_details.read().unwrap().clone()
+    }
+
     /// Updates the service to authenticate with the homeserver for the
     /// specified address.
     pub fn configure_homeserver(&self, server_name: String) -> Result<(), AuthenticationError> {
@@ -181,23 +201,4 @@ impl AuthenticationService {
         client.restore_session_inner(session).map_err(AuthenticationError::from)?;
         Ok(client)
     }
-
-    /// Get the homeserver login details from a client.
-    async fn details_from_client(
-        &self,
-        client: &Arc<Client>,
-    ) -> Result<HomeserverLoginDetails, AuthenticationError> {
-        let login_details = join3(
-            client.async_homeserver(),
-            client.authentication_issuer(),
-            client.supports_password_login(),
-        )
-        .await;
-
-        let url = login_details.0;
-        let authentication_issuer = login_details.1;
-        let supports_password_login = login_details.2.map_err(AuthenticationError::from)?;
-
-        Ok(HomeserverLoginDetails { url, authentication_issuer, supports_password_login })
-    }
 }
diff --git a/bindings/matrix-sdk-ffi/src/lib.rs b/bindings/matrix-sdk-ffi/src/lib.rs
index 144be8c09..84d2ca4b9 100644
--- a/bindings/matrix-sdk-ffi/src/lib.rs
+++ b/bindings/matrix-sdk-ffi/src/lib.rs
@@ -77,7 +77,9 @@ mod uniffi_types {
     pub use matrix_sdk::ruma::events::room::{message::RoomMessageEventContent, MediaSource};
 
     pub use crate::{
-        authentication_service::{AuthenticationService, HomeserverLoginDetails},
+        authentication_service::{
+            AuthenticationError, AuthenticationService, HomeserverLoginDetails,
+        },
         client::Client,
         client_builder::ClientBuilder,
         room::{Membership, MembershipState, Room, RoomMember},