I can help you to troubleshoot this issue with small steps.
1)Check whether this is as same as with all the browsers or one particular browser.
2)Go to that particular browser and Check if there is any Real time Scanner extensions are installed in that particular Browser
3)If yes Confugire an exemption for Microsoft Learn site making it as a trusted one.
This will most probably sort this issue.Please check and confirm.
Thank you
Kind regards
Isuru