What should I do: when tracking refund on IRS site, says they need to verify my identity and they mail something which I never got. Is this common? Return accepted on TT

My return says "Accepted" on Turbotax but when tracking with IRS tool, receive this message "To protect you from identity theft, your tax return is currently being reviewed. To help us process your return more quickly, verify your identity and tax return information. If you recently received a letter from us, follow the instructions on the letter."

No information has changed since last year, even refund amount is the same. Is there anything I can do to speed up the process. Turbotax has my estimated return date as Feb. 8 - today.