Thai Health Pass rejected. What to do?

Hi lovely people. It’s my first time in beautiful Thailand. At immigration, my country was flagged for needing Yellow fever vaccine which I do have but didn’t bring my card with me because during all my research I didn’t see anything about needing this vaccine. Anyways, I filled out the form at the desk with WHO and was allowed to enter. I got an email an hour later saying my Thai Health Pass was rejected. I have subsequently travelled to Phuket and Krabi since then with no issues. The form says I can be fined after 6 days if I don’t check in with authorities. What do I do? Where do I go? And should I be worried?