@Sadil ,
I try to visit the said website in the MS Edge legacy and in the MS Edge (chromium) browser.
I found that the site is working fine in both MS Edge browsers.
You said you are getting the 404 error, A 404 error message is a Hypertext Transfer Protocol (HTTP) status code indicating the server could not find the requested website. In other words, your web browser can connect with the server, but the specific page you're trying to access can't be reached.
It can be possible that the site is down for some seconds, I suggest you again try to visit the site using the Edge browser to check whether you are able to access it.
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