Is there a way to find my control number from my taxes? I need this to verify my identity online but I haven’t received the letter they supposedly sent me twice now.

To verify online, I need a control number which is in the letter I have yet to receive. I have requested it once again already which is the max times. If I could manage to find my control number for this years taxes I would be fine to proceed with verification online. Is this something TurboTax would have a record of or do I just need to call the irs again and sit on hold for hours?