I am developing a Facebook app for a client. I want to add the client as a tester to the Facebook app so he can play around with it and give me feedback. The client and I are not friends on Facebook, so I am trying to add him by his Facebook ID, as instructed in the Add Tester modal.
When I enter his ID, I get a red x with the error message: "XXXXXXXXXXXX could not be resolved to a valid user ID or name." I have checked that the Facebook ID he gave me is correct via the Facebook Graph API Explorer.
How do I add him using his Facebook ID and get around this problem?
It seems that one must use the username of a person who is not their friend to register that person as a tester for your app. (Thanks @CBroe for asking me to try that.)
Unfortunately, the username field is deprecated in the Facebook Graph API for versions 2.0 and higher:
{
{
"error": {
"message": "(#12) username field is deprecated for versions v2.0 and higher",
"type": "OAuthException",
"code": 12,
"fbtrace_id": "GnJd8sMSb7l"
}
}
As far as I can tell, the best way to get the username from Facebook ID is to browse to https://www.facebook.com/{id} and grab the username from the redirected url, which will be https://www.facebook.com/{username}.