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Preview not working - 401 ERROR /passthrough?provider=spo&...
It sounds like you're dealing with a complex issue regarding PDF previews in SharePoint, and it's certainly frustrating when some work while others do not. A 401 error typically points to authentication problems, so there are several areas to explore:
Recheck Permissions: Ensure permissions are set correctly at all levels—files, folders, and libraries. Double-check that no permissions have been inadvertently changed.
Authentication Settings: Review SharePoint’s authentication configurations and any Single Sign-On (SSO) settings that could be causing issues.
File Paths and Size: Verify that the PDF files are not corrupt and that file paths do not contain special characters or exceed length limits.
Consult Logs: Check SharePoint and browser logs for any additional clues.
For further insights and solutions, you might find relevant information or similar cases discussed on platforms like https://fintechzoomcrypto.com/bitcoin-fintechzoom/ . Their tech-focused content often covers similar issues and could offer additional guidance.