iCloud
account details could not be opened is showing up when i attempt to sign in to my email accounts.
MacBook Air 13", macOS 10.14
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You need to set up mail accounts https://support.apple.com/en-in/guide/mail/set-up-mail-with-your-email-accounts-mail35803/mac
And then view account details see this article https://support.apple.com/en-in/guide/mail/view-email-account-information-mlhlp1193/mac
Make sure in system preferences > iCloud the Apple ID is signed in. , also the web mail address like gmail , yahoo ...etc address is same as Apple ID address and this will connect the Apple ID with iCloud server account .
You can't view mail account details on www.icloud.com