500 Internal Server Error on v1_0/apiuser

Hello, it seems that the sandbox server is acting up again. I am receiving a 500 error with every user creation request.

HTTP response

HTTP/1.1 500 Internal Server Errorcontent-length: 111content-type: application/jsonvary: Origin{    "statusCode": 500,    "message": "Internal server error",    "activityId": "ed08f380-6e61-4ccf-bd2b-4a651709681b"}