Ay, that's frustrating, "invalid month check due date" usually means the system is saying ang month range mo doesn't match up with your actual due date sa records nila, or baka may issue sa how the months are formatted sa application. I'd suggest double-checking na ang your due date sa SSS is correct first, then try regenerating the PRN with dates that align with it, a few of us had to go back and forth with SSS customer service online or sa phone kasi sometimes their system is finicky talaga with the date matching. You might also want to check if there's a specific format they need (like MM/DD/YYYY) or if you need to adjust the month range to match exactly kung kailan ka talaga eligible based sa your contribution history. If it keeps rejecting, honestly the safest move is to call or visit SSS directly kasi they can see your actual account and tell you exactly what's wrong, mas mabilis yan kaysa mag-troubleshoot online.
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