Hi Michael,
Thanks for your reply.
Yes, I’m also using SNMPv2 and it works.
But it makes no sense, to not fix this bug.
“Save&Test” in WATO works with SNMPv3, why not make the check able to use the proper snmp-context?
I got all my devices to work with SNMPv3, would be great to have also the HP Printers work with SNMPv3.
I will give it a try and send a mail to the address you mentioned above.
Let’s see 
Kind regards
Georg