AAnytime Award SFO-STX

Hi all-

I'm trying to book an economy or business AAnytime award from SFO-STX. My preferred routing is SFO-MIA + MIA-STX. I see availability in AAnytime on aa.com for SFO-MIA and for MIA-STX (AA272, AA1293). But I can't manage to get aa.com to show this routing.

How do I get this to show? I'm used to the tricks to get DL to price awards, but I've never had this issue with AA. Do I need to have help from a CSR?

Thanks.