The issue could not be solved and I returned the 1920 - this switch is useless.
I had a case with HPE support and after about a dozen tries of the support engineers including escalating to L3 I simply stoped receiving any further notice on the case. I received CLI commands that the 1920 did not know and more ... the support engineers seem to have no clue of this switch.
Fincal conclusion: Switch unuseable, HPE support unuseable/helpless -> return HP device and go back to Cisco.
Since that essay, we simply use and also recommend to our customers to not use HP network equipment.