Second Stimulus check missing and line 30

Hi,

I never received my second stimulus check although "wheres my payment" said it was mailed to me. (I live abroad) I assume it was lost in the mail (not uncommon for Brazil). I claimed the Recovery Rebate Credit on line 30 as instructed by Turbotax. I have since learned that there is a trace my payment function. I have tried to contact the IRS but they are so overwhelmed that I can never get through to this "trace my payment" service. My question is should I persist to try to make a "trace my payment" or will the line 30 Recovery Rebate Credit be sufficient?