I am using the normal setup for sending invites through the requests dialogue:
FB.ui(
{
method: \'apprequests\',
message: \"Please add me, I am do
There's two simple things that might cause that problem.
One is that you application is missing the Canvas. Just add it from the your App panel in Facebook Developers.
The second one - make sure your app is NOT in SandBox Mode. If it is it won't send any notifications. I lost hours before figuring that out and changing the code in all possible ways.
Hope that helps.