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I'm a member of a SharePoint site as an external user and have access to a document library with lots of files/folders. I want all of this content downloaded for offline usage and sharing. I'm unable to sync this library via OneDrive I believe because I am an "external" user OneDrive Sync Error and it appears sync works only with internal accounts.

Besides manually downloading the files, can I download this content programmatically as an external user? Assume I only have access via my credentials which requires MFA/2FA - so no service accounts, App accounts, etc.

C# CSOM, PowerShell, etc. are all options for me if it's even feasible as an external user with MFA.

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First, you should be aware that the Synchronizing content using an external or guest user is currently not supported by OneDrive. so the external users with Microsoft account can't sync the SharePoint library.

Read more at Restrictions and limitations in OneDrive and SharePoint

Also, if the site admin set the "Allow items from this site to be downloaded to offline clients" to NO in the site settings, the external users will not be able to download files!

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As a workaround, If you already can download the files, you can simply select all files and hit Download button to download all files from a document library in modern libraries.

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