In the past I've been able to redeem Avios on domestic AA routes and my understanding is that BA redemptions are from the AA "Economy MileSAAver" bucket. I'm looking at a route that has Economy MileSAAver availability on AA.com but nothing is showing as available on BA.com, which is a shame as I have enough miles/Avios between AA and BA that I could book us redemptions one way in Coach via BA and the other in First via AA. (I do have enough AA miles to redeem round-trip in Coach if it comes to it.)

Is this possibly a transient BA IT issue that may eventually clear? Alternatively, If I can definitely see Economy MileSAAver availability on AA.com would a BA call center agent be able to see it and book me a redemption even though it's not showing on BA.com? Or is my understanding of how AA reward availability maps to BA faulty?

Many thanks as always to any experts here that can help.