Why can I not check the status of my refund?

https://turbotax.intuit.com/tax-tools/efile-status-lookup/  

https://ttlc.intuit.com/questions/2584108-why-is-there-no-record-of-my-return-at-where-s-my-refund-wmr?jump_to=answer_4242575

Sometimes people get confused by the “summary” given by TurboTax and use the wrong amount for the federal refund.  Make sure you are only using the federal refund amount, and not an amount that combined your federal and state refunds.

Your federal refund amount is on line 20a of your Form 1040

https://www.irs.gov/refunds/tax-season-refund-frequently-asked-questions

At one point I could check my status.  I was asked to verify identity and ever since I have not been able too.