Upon user registration, we are trying to add some external ids to the user data. Currently, we have a webhook firing on the user.registration.complete event, and looks like according to the following links, we should be able to update user.data with a call to the FusionAuth API in the user.registration.complete webhook:

https://fusionauth.io/community/forum/topic/1443/how-to-get-populated-user-data-after-user-registraion/7
https://github.com/FusionAuth/fusionauth-issues/issues/1545

Now, here is where we are having problems updating the user. During a simple email/password registration, this works flawlessly. We are able to use the FA client and call PatchUserAsync to add custom ids to the user. But, when a user signs in using a new Facebook login, we get a 404 returned on the PatchUserAsync call. I've done a lot of debugging, and I've confirmed on a new Facebook login, user.create is initiated along with user.registration.create afterwards. But it looks like only during a new Facebook login (maybe all new social logins?), we can't find the created user to update with some external ids.

Here's some code for reference (using C#):

    var response = await _fusionAuthClient.PatchUserAsync(userId, new Dictionary<string, object>
    {
        { "user", request }
    });

userId is the GUID we get in the event object, and request is the following object:

        var userData = new Dictionary<string, object> {
            { "id1", "12345" },
            { "id2", "23456" }
        };

        var request = new Dictionary<string, object>
        {
            { "data", userData },
            { "email", user.Email }
        }

I'm thinking this is either a bug, or I'm misunderstanding the user object when a new registration is created for a social login. Any help is greatly appreciated!