Do not use prepend_before_action to find user

This results in find_user being called before the current_user is
properly set up

modules/two_factor_authentication/app/controllers/two_factor_authentication/base_controller.rb

@@ -8,7 +8,7 @@ module ::TwoFactorAuthentication
     before_action :ensure_enabled_2fa
 
     # Locate the user we're editing
-    prepend_before_action :find_user
+    before_action :find_user
 
     before_action :find_device, only: %i[confirm make_default destroy]
 

modules/two_factor_authentication/spec/features/admin_delete_two_factor_device_spec.rb

@@ -0,0 +1,37 @@
+# frozen_string_literal: true
+
+require_relative "../spec_helper"
+
+# Regression test: find_user in BaseController used prepend_before_action, which ran it
+# before ApplicationController#user_setup could set User.current from the session.
+# User.visible defaults to User.current, so without User.current set to the admin,
+# the target user was not found (404).
+RSpec.describe "Admin deleting another user's 2FA device", :js,
+               with_settings: {
+                 plugin_openproject_two_factor_authentication: { "active_strategies" => %i[developer totp] }
+               } do
+  let(:dialog) { Components::PasswordConfirmationDialog.new }
+  let(:admin_password) { "adminadmin!" * 2 }
+  let(:admin) { create(:admin, password: admin_password, password_confirmation: admin_password) }
+  let(:other_user) { create(:user) }
+  let!(:device) { create(:two_factor_authentication_device_totp, user: other_user, default: false, active: true) }
+
+  before do
+    # Use a real browser login so the session is established via the normal auth flow
+    # (user_setup callback), not via RequestStore stubbing. This exposes the
+    # prepend_before_action ordering bug where find_user ran before User.current was set.
+    login_with(admin.login, admin_password)
+  end
+
+  it "deletes the device" do
+    visit edit_user_path(other_user, tab: :two_factor_authentication)
+
+    expect(page).to have_css(".mobile-otp--two-factor-device-row", count: 1)
+
+    find(".two-factor--delete-button").click
+    dialog.confirm_flow_with(admin_password)
+
+    expect(page).to have_css(".generic-table--empty-row")
+    expect(other_user.otp_devices.reload).to be_empty
+  end
+end