Oculus Integration's GetLoggedInUser() returns user ID = 0

The implementation itself is minimal to present the issue:

Users.GetLoggedInUser().OnComplete(delegate (Message<User> message){ user = message.Data; });

For multiple accounts we would test against internally, which previously worked, we now receive a user with ID = 0, both in Unity Editor and on new and previous builds of the project where they once worked correctly. These accounts on Oculus PC have matching Oculus Quest accounts which do continue to work as intended.

Has this been observed by others? The problem appears to have arose in the last few months.