hi Gunter, that's interesting to me we have campaigns and I never got into that where MDO hasn't detected a malicious links which a user clicked at. Would you mind elaboration how you created the campaign so we could try it out and then if you haven't done report back to MSFT
All info from campaigns should be available at
https://learn.microsoft.com/en-us/microsoft-365/security/office-365-security/campaigns?view=o365-wor... , I haven't tried to automated anything using PowerAutomate yet but should be my next call to try it ( PowerAutomate + check the clicked links from MDO reports )