From Turnitin on 19th, May in the morning:
Users accessing Turnitinuk.com via Blackboard integrations may be encountering 500 errors while attempting to access to the service. We are investigating this issue as our top priority.
Apologies for any inconvenience this may be causing. To track the progress of this incident please view our status page – https://bit.ly/3fKMg8l
From Turnitin as of 10:15am on 19th May:
Users accessing Turnitin UK via Blackboard integrations should now be able to access the service again. We are continuing to monitor the situation and will continue to provide updates on the status of the service.
May 19, 10:17 BST