If your teacher has disabled the Turnitin similarity score for the entire course of the assessment, this is a known Turnitin limitation.
You can still access your feedback and comments by clicking on the speech bubble icon from the right side panel of the Turnitin page.
If your teacher has enabled it, you can find a PDF copy of your submission within your submission confirmation email.
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If you have any other questions, please feel free to contact us here.