Here are the solutions for Epic Games: https://ecosec.on.epicgames.com/
for Microsoft: https://login.microsoftonline.com/
and for ebook . de: https://blog.ebook.de/
A little “how to”:
- Use the “subdomain finder” on a page like dnsdumpster.com and / or nmmapper.com.
- Try out the subdomains that are being found as the 1st URI.
Please note that this is not 100% accurate and the chosen subdomain might “loose” the icon or get a completely different one. However, at least right now the addresses mentioned above if used as the 1st URI provide the correct icons.