Greetings AMiguelVargasJr,
Thanks for visiting the Apple Support Communities! It seems you're unable to use iCloud Mail when visiting iCloud.com as expected.
Does the issue persist if you use a different web browser? Check out the troubleshooting in the article below:
If iCloud Mail isn't working - Apple Support
On your iPad, Mac, and PC, you can use iCloud Mail on iCloud.com. On an iPhone, use the Mail app instead.
- Make sure your browser is up to date. If you're using Safari, update Safari to its latest version.
- Clear your browser's cache. In Safari, choose Safari > Preferences. Click the Advanced tab. Select "Show Develop menu in menu bar", then close Preferences. Click the Develop menu, then select "Empty Caches." If you're using a different browser, check its help menu for steps.
- If you can access iCloud Mail from a different location or Internet connection, contact your Internet service provider (ISP) or network administrator. Some Internet configurations intentionally or unintentionally prevent access to certain websites or services, such as iCloud Mail."
Kind regards.