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I`m trying to login at microsfot 365 premium.
I used a personal email as administrator, and now I can`t even login anymore.
microsoft premium redemption.pngerror loging admin center.png
You may try the domain email address that Microsoft 365 created for you when you signed up with the Business subscription, (for example, user(at)contoso.onmicrosoft.com) using InPrivate/Incognito window with different browsers to directly access the link (https://admin.microsoft.com/) to login Microsoft 365 admin center to check this issue.