Click on Login and follow the registration flow.
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If your SharePoint environment is MyCompany.SharePoint.com , fill out ONLY MyCompany under company name above, and don’t use any slashes in the name.
Note that the SharePoint account used for login MUST have access to the root site at the top of your SharePoint URL domain [https://[yourdomain].sharepoint.com].
The user configured as Anonymous Access User MUST have access to this root folder as well.