Exact same thing happened to me. Never got the 2nd stimulus check, I moved so both my address and banking information changed. So I filed early and claimed the Recovery Rebate Credit. They delayed my return beyond 21 days and subtracted $600 from my refund. Same reasons on the information tab, none of which could apply to my situation. They do say I will get a letter. 

I signed up for an IRS profile to see the information on the stimulus payments and it clearly shows I never got the 2nd one. I do see that they tried to auto-deposit the 3rd stimulus to the wrong account again on the 17th(though I filed Feb 12 to prevent this). A few days after seeing that- they show they are mailing the payment-so the bank returned it. If they then mailed the 2nd one to the wrong address-who knows when they will get that back and be able to show for sure I did not get it.