base receive callback not triggered

I am working on an application for an LE Audio Broadcast sink on an nrf5340 Audio DK.
I am using code from the nrf5340 Audio application (v2.6.0) for the le audio parts. I am able to scan for a broadcast and set up a PA sync and I register the bap broadcast sink callbacks (bt_bap_broadcast_sink_register_cb) without errors. I am using the nrf5340 audio gateway example application as the broadcast source on another nrf5340 audio DK.

The syncable callback is triggered, but the base_recv callback is never triggered and I can't figure out why. It is triggered if I run the example headset application, so the base should be received (?). Any idea what I could be missing?

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