If you sign up for rent reporting and don't see your rent amount on the report, it is still reporting correctly!
Typically, if you're unable to see the rent amount on your credit report, it is because the service provider you're using (e.g., Credit Karma) simply hasn't enabled the amount to be viewable.
However, the rent reporting and the subsequent benefits of reporting rent payments to TransUnion (potential increase in credit score) are still active.
To view the full activity, you can use the link TransUnion provides to pull your credit report showing the rent amount AND see how the rent reporting is benefiting you!