diff --git a/changelog.d/2057.bugfix.md b/changelog.d/2057.bugfix.md
new file mode 100644
index 000000000..46379bdd5
--- /dev/null
+++ b/changelog.d/2057.bugfix.md
@@ -0,0 +1 @@
+Re-introduced admin room registration alerts that were accidentally removed in the OAuth2 update.
diff --git a/src/api/client/account/register.rs b/src/api/client/account/register.rs
index 5a65429a0..6d653fdd8 100644
--- a/src/api/client/account/register.rs
+++ b/src/api/client/account/register.rs
@@ -138,6 +138,26 @@ pub(crate) async fn register_route(
 	};
 
 	debug_info!(%user_id, ?device, "New account created via legacy registration");
+	// Only log if the user wasn't registered via an appservice.
+	if body.identity.is_none() {
+		let notice = if device.is_some()
+			&& let Some(device_name) = body.initial_device_display_name.as_ref()
+		{
+			format!(
+				"New user \"{user_id}\" registered on this server from IP {client} and device \
+				 display name \"{device_name}\" via legacy registration",
+			)
+		} else {
+			format!(
+				"New user \"{user_id}\" registered on this server from IP {client} via legacy \
+				 registration."
+			)
+		};
+		info!("{notice}");
+		if services.server.config.admin_room_notices {
+			services.admin.notice(&notice).await;
+		}
+	}
 
 	Ok(assign!(register::v3::Response::new(user_id), {
 		access_token: token.map(DeviceToken::into_token),
diff --git a/src/web/pages/account/register.rs b/src/web/pages/account/register.rs
index 4f5f4f11a..d49c02c55 100644
--- a/src/web/pages/account/register.rs
+++ b/src/web/pages/account/register.rs
@@ -7,7 +7,7 @@ use axum::{
 	routing::{get, on},
 };
 use conduwuit_api::client_ip::ClientIp;
-use conduwuit_core::{config::TermsDocument, warn};
+use conduwuit_core::{config::TermsDocument, info, warn};
 use conduwuit_service::{
 	mailer::messages,
 	registration_tokens::ValidToken,
@@ -536,6 +536,13 @@ async fn complete_registration(
 			.mark_token_as_used(registration_token);
 	}
 
+	let notice = format!("New user \"{user_id}\" registered on this server from IP {client}.");
+
+	info!("{notice}");
+	if services.server.config.admin_room_notices {
+		services.admin.notice(&notice).await;
+	}
+
 	let user_session = UserSession { user_id, last_login: SystemTime::now() };
 
 	session_store