Use a custom findOneByEmail to search for existing user

packages/core/admin/ee/server/controllers/authentication/middlewares.js

@@ -27,7 +27,7 @@ const authenticate = async (ctx, next) => {
       return ctx.redirect(redirectUrls.error);
     }
 
-    const user = await getService('user').findOne({ email: profile.email });
+    const user = await getService('user').findOneByEmail(profile.email);
     const scenario = user ? existingUserScenario : nonExistingUserScenario;
 
     return scenario(ctx, next)(user || profile, provider);

packages/core/admin/server/services/user.js

@@ -180,6 +180,19 @@ const findOne = async (id, populate = ['roles']) => {
   return strapi.entityService.findOne('admin::user', id, { populate });
 };
 
+/**
+ * Find one user by its email
+ * @param {string} id  email
+ * @param {string || string[] || object} populate
+ * @returns
+ */
+const findOneByEmail = async (email, populate = []) => {
+  return strapi.query('admin::user').findOne({
+    where: { email },
+    populate,
+  });
+};
+
 /** Find many users (paginated)
  * @param query
  * @returns {Promise<user>}
@@ -309,6 +322,7 @@ module.exports = {
   register,
   sanitizeUser,
   findOne,
+  findOneByEmail,
   findPage,
   deleteById,
   deleteByIds,