Has one of your participants lost their invitation email? Or do you just need to check how many reminders they've received?
This is easy to achieve:
Open your project
Click Feedback on the left-hand side
Click on the name of someone being assessed
Next to the list of feedback providers, click the View button to view the emails that were sent.
Note: if a response has been submitted, then clicking View will show their response rather than the emails that were sent. Instead, click the dropdown arrow next to the View button, and then select View emails.
What you'll see when you view the emails
You'll be able to view all of the invitations and reminders that have been sent. And you can copy or click on the link that they need to use.