I recently bought a BSP, for its sequencer and CV capabilities as much as for the drum pads. I have it connected to the Kronos via USB, and am trying to sync them up in terms of tempo, but also possibly control the Kronos’s sequencer with the BSP’s transport buttons. ...and it’s not working

I have tried setting the Kronos to receive clock, and the BSP to send (“Auto USB” or “External USB” on the Kronos Global MIDI page, sync set to “Int” on BSP); also the other way round (“Auto USB” or “Internal” on Kronos, sync set to “USB” on the BSP). But whoever I set as the master, the slave does not follow. The two are talking, because I can trigger sounds in the Kronos from the BSP’s sequencer; but the clock sync does not work. Also, the slaved sequencer does not start together with the master sequencer.
Does anyone have this running, and can tell me what I’m doing wrong? Does the Kronos react to clock on the USB A ports at all, or only on the B port (from a PC)?