Key component of the Connect ID - hashing - is currently unavailable. You will receive 500 error when trying to Register or Update Person. Other functions are OK.
The reason is unavailability of the key component Elasticsearch (outage problem).
Problem's status can be checked here: https://cloud-status.elastic.co/.
Update: The system has been out between 11:48 UTC and 13:05 UTC due to unavailability of the external component.
It has been operational since 13:05.