I exceeded my identity verification attempts
You can finish verification over the phone. Call TransUnion, ask to verify your identity manually, and give them the email address you use on RentSpree. You'll find their number and hours in How can I contact TransUnion?
They'll ask you additional questions by phone, and you have two attempts. If both are unsuccessful, verification locks for 30 days before you can try again.
Once you're verified, return to your application and continue where you left off.