DKIM/DMARC issue

User name: Werner99

TITLE

DKIM/DMARC issue

PRODUCT, VERSION, OPERATING SYSTEM, ARCHITECTURE

debian 9.11, plesk Version 18.0.23 Update #1

PROBLEM DESCRIPTION

DKIM spam protection setting is missing under Tools & Settings > Mail Server Settings

when i try to enable DMARC i get the following Error message

"Unable to change settings for DMARC. To enable this option, please switch on DKIM and SPF spam protection."

according to mail-tester.com DKIM is...

DKIM/DMARC issue