March 31st, round 7pm Australian time:

"Regarding the UHRS assessment, UHRS is making some technical changes on their side. To prevent the new users from not being able to log into UHRS, we will hold the assessment until the changes have been completed. Please rest assured that this is only temporary, and the assessment will be back within the next week. We hope you will be patient and come back to take the UHRS assessment a few days later."