As a workaround for BSP6.6 I have created an aktualizr-torizon_%.bbappend
in which I set the version of aktualizr-torizon to the one used in BSP6.5:
# command 'aktualizr-torizon once' not working in BSP6.6
# -> set version to the one used in BSP6.5
SRCREV = "d71f18a1b8139cd4adadb41667b73d7c92fdbd9f"
Best regards,
Markus