Hi mama! Usually sa most apps, you just type the zip code as is, no spaces or dashes needed, just the numbers lang talaga. If it's still not accepting it, try checking if the app wants 4-digit or 5-digit format (some areas use different lengths), or maybe refresh the app or try a different browser if you're on desktop. One of my mum friends had the same issue and it turned out she needed to update her app version, so try that din if nothing works!