User Lock outs since installing defender

Hi, All my users keep getting locked out after logging in successfully.

The email report coming back from defender is:
We've just locked out the host 86.151.233.225 from http://harriscm.co.uk due to more than 20 404 requests for the file /wp-content/uploads/2017/fonts/fontawesome-webfont.svg?v=4.4.0. They have been locked out for 300 seconds.

I can not log in for long enough to see the reports.

Please help!!!
James