Hello guys, I had the same problem and I even used a VPN to access my account, but as soon as I deactivated it and refreshed the page the problem persisted, by the way I use Microsoft's edge browser.
The only thing I did was: in the settings, look for the option to "delete browsing data" then click on "choose what you want to delete" then I chose to delete cookies, temporary Internet files, even the download history (maybe not everything is necessary), once deleting all that I closed the browser, waited about 10 seconds, I opened the browser again, opened the page and everything came in normally, the login was fast and without DDOSguard checking, I closed the session and tried in a tab privately or incognito and was still fine.
I hope it helps you, by the way I am not a native English speaker so I used a translator, I hope you can understand me