diff --git a/Common/UI/Utils/ModelAPI/ModelAPI.ts b/Common/UI/Utils/ModelAPI/ModelAPI.ts
index e394bbb6db..4df3cb4ef3 100644
--- a/Common/UI/Utils/ModelAPI/ModelAPI.ts
+++ b/Common/UI/Utils/ModelAPI/ModelAPI.ts
@@ -333,6 +333,14 @@ export default class ModelAPI {
 
       if (project && project.id) {
         headers["tenantid"] = project.id.toString();
+      } else {
+        // Fallback to getCurrentProjectId() when full project data is not yet loaded
+        // This can happen after SSO login when the project ID is available in URL/SessionStorage
+        // but the full project data hasn't been fetched yet
+        const projectId: ObjectID | null = ProjectUtil.getCurrentProjectId();
+        if (projectId) {
+          headers["tenantid"] = projectId.toString();
+        }
       }
     }