You can use UserGuiding User API to check if the user IDs you sent to UserGuiding have successfully arrived.
Alternatively, as a current and one of the identified users (a unique ID is sent for you), you can access one of your platform pages where UserGuiding's container code is installed.
Here, by opening the Troubleshooter, you can view Current User Information to find your unique ID.
As you can see from the image below, User Identification is Completed ✅ for the current user because a unique ID is assigned to them.
Their unique User ID is 10149.