Problem occured in scanning because a mandatory key is missing

Looks like your authentication didn’t work. Have a look at https://community.greenbone.net/t/hint-verify-target-configuration-access-for-authenticated-lsc-scans/219 about requirements and indications for a successful authentication.

That said I would recommend to start with a “Full and fast” scan. This config will do authenticated checks as well (provided that your authentication is set up correctly). The difference between these scan configs is rather e.g. how unscanned ports are treated than if authentication is enabled or not.

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