A Microsoft file hosting and synchronization service.
Hello Renee,
If Microsoft 365 is showing that your account or email address has been denied permission, the first step is to determine whether this is a personal Microsoft account or a work/school account.
If it is a work or school Microsoft 365 account, access to OneDrive and Excel can be controlled by your organization's Microsoft 365 administrator. In that case, you will need to contact your organization's IT administrator and ask them to check whether your account is blocked, disabled, unlicensed, or affected by a Conditional Access policy.
If it is a personal Microsoft account, try signing in directly at Microsoft 365 on the web and check whether you receive a specific error message. Also verify that you are signing in with the same account that owns the Microsoft 365 subscription.
If possible, please provide the exact error message or error code you're seeing (without posting your password or other personal information). That will help determine whether this is an account, licensing, or permissions issue.