Indeed, I tried on my iX with a OBDLink CX and Bimmercode & Bimmerlink apps, but the car is not recognized. I also tried with ABRP with the same OBDLink CX and ABRP simply doesn't have the OBD button enabled when you got to the car settings for the iX.
I reached out to ABRP and they have confirmed that the iX is currently not supported but they say they regularly add cars in the supported list (so hopefully soon?).
I'm mainly interested in ABRP support for OBD interface on the iX to get live data in ABRP.