We would like to integrate Turnitin to BB by LTI for our 4 schools on our one blackboard instance with institutional nodes created below . 
4 schools have different Turnitin accounts! This is important. 
I have done the integration by using instructions here: 
https://help.turnitin.com/feedback-studio/blackboard/lti/administrator/getting-started/configuring-turnitin-in-blackboard.htm 
It works perfectly for the first school. 
For the second school. I created a second placement under the Turnitin Feedback Studio. 
For the second placement it never asks for an administrative account and all our teachers are created newly under the first school. 

Is there a way to pass the Turnitin School IS specifically for that school.

Please help!!! This is urgent. 
Thank you!