Sign in to a Microsoft 365 SharePoint site - Microsoft Support
https://support.microsoft.com/en-us/office/sign-in-to-a-microsoft-365-sharepoint-site-340ba63a-8bdd-4a36-90a8-e54b76a2ccac
WebUnder Account, tap the currently selected account. (If you’re currently signed out of all accounts, tap Sign In ). Under Connected Services, tap + Add a Service. Under Connect a Cloud Service, tap OneDrive for Business. Enter your email address and password, then tap Sign In. Tap Settings, then Close.
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