New small tenant, subscription Active. Currently in trial period but billing is set to start at the end. All SharePoint/OneDrive writes fail in the browser and in sync, but Outlook works. Billing, subscription and user licences all look healthy. Microsoft’s tenant storage diagnostic shows 0.01 GB used of 1,274 GB, and PowerShell shows every site as Unlock. Microsoft support is looking into it. I’ve seen two similar reports on Microsoft Q&A within the last week (both new tenants). Are there any other fixes or checks that could be performed to resolve the issue?