I created an app engine app (deployed and working) that I want to add to my google apps primary domain. I followed the directions in the app engine console (going through Administration -> Add Domain). I typed my domain in and get to the page with the terms and services. the page has the title: You have requested that the ' YOUR_APP_ENGINE_SERVICE_HERE ' service be added to your domain the url is https://admin.google.com/AdminHome?appId=YOUR_APP_ENGINE_SERVICE_HERE&chromeless=1#OGX:AddAppEngineService
I check the checkbox to accept the terms and services then click activate, after a few seconds I get back to the same terms and services page. I get no errors that tell me anything.
If this helps my google apps account is one of the grandfathered free accounts (< 10 users).
Thanks