I have not received my tax refund yet. It was submitted on 04/02/2025. However, they sent me a letter to confirm my identity, which I confirmed and still no refund.

It takes quite a while for the IRS to check everything out. You will get your refund in due time. 

It often takes at least nine weeks---sometimes longer -- after verifying identity to receive your refund.  ONLY the IRS is in control and only the IRS can tell you when your refund will be issued.