We have confirmed the issue is fixed.

We are rolling out the fix and monitoring the production

We have identified that the issue is with our third-party login provider. They are working on a fix. They also identified that this issue might have an impact on clients, not just participants.

We have identified the root cause of this incident as likely originating with a third-party provider. We are currently in contact with them to investigate and resolve the issue. We will provide further updates as more information becomes available.