I don't think there is an identity verification tab. I have never seen one or heard of one.
When Upwork wants a freelancer to do an identity veification step, Upwork notifies the freelancer. There is no user interface component for proactively requesting this.
Once you`re required to verify your profile our team will reach out to you directly with detailed instructions. At the moment, you don't have any pending verifications. Thank you.
I wanted to note that this is a thread from October 2019, but thank you for participating in the discussion. There are different reasons why a freelancer will be asked to verify their account. If there's a need to verify the account, the team will reach out through an email or a notification in your Upwork account with further instructions on how you can complete the verification process.