diff --git a/CHANGELOG.md b/CHANGELOG.md
index d7df6213fed..ecf2199ea6e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1 +1,2 @@
-- Added new commands for managing Firestore backups and restoring databases (#6778)
+- Added new commands for managing Firestore backups and restoring databases. (#6778)
+- Fixed quota attribution for Firebase Auth API calls. (#6819)
diff --git a/src/gcp/auth.ts b/src/gcp/auth.ts
index 7c670df4752..6ca03a32c6b 100644
--- a/src/gcp/auth.ts
+++ b/src/gcp/auth.ts
@@ -11,6 +11,7 @@ const apiClient = new Client({ urlPrefix: identityOrigin, auth: true });
 export async function getAuthDomains(project: string): Promise<string[]> {
   const res = await apiClient.get<{ authorizedDomains: string[] }>(
     `/admin/v2/projects/${project}/config`,
+    { headers: { "x-goog-user-project": project } },
   );
   return res.body.authorizedDomains;
 }
@@ -28,7 +29,10 @@ export async function updateAuthDomains(project: string, authDomains: string[]):
   >(
     `/admin/v2/projects/${project}/config`,
     { authorizedDomains: authDomains },
-    { queryParams: { update_mask: "authorizedDomains" } },
+    {
+      queryParams: { update_mask: "authorizedDomains" },
+      headers: { "x-goog-user-project": project },
+    },
   );
   return res.body.authorizedDomains;
 }