If  a user changes the email address associated with their Blackboard account, this change will not be passed to Turnitin. Also, If the user  is unlinked and then goes on to change their email address, a new  Turnitin user account will be created making two separate users.

Workaround:  Users can email the Turnitin Support team at tiisupport@turnitin.com and they  will be able to assist with updating your account to the relevant email  address.