Hello! Sorry if this is a dumb question, I hope someone can help

I joined as and am currently a DX9, but when I did the PMR thing electronically this year, next to my name it said DX10S. I wasn’t informed I got promoted… is there a letter/was my boss supposed to tell me? Or is the announcement at a later date? Or did I not get promoted and it’s some sort of error?

Thanks!