Intermittent SharePoint Connection Authentication Issue in Microsoft Fabric

Hi SanyamSingh2119,

Since re-authenticating the Fabric connection immediately restores both existing shortcut access and new shortcut creation, this looks more like a stored credential / OAuth token refresh issue than a SharePoint folder permission issue.

One thing I would check is the shortcut connection itself from the Lakehouse side: Lakehouse → Settings → Shortcut connections. OneLake shortcuts use shared cloud connections, and these can be reviewed or replaced there if a shortcut connection becomes broken or requires action.

Also, SharePoint/OneDrive shortcuts support different authentication methods, including Organizational account, Workspace identity, and Service principal.

If the current connection uses an interactive OAuth/Organizational account, I would review Entra ID Conditional Access, MFA/sign-in frequency, password/session changes, or token revocation events, as these can force re-authentication even when the SharePoint permissions themselves are still valid. 

For a more stable production pattern, I would test creating a new SharePoint shortcut connection using Service principal or Workspace identity, if supported in your environment. If the issue only happens with the OAuth/Organizational account connection, it is likely session/token-policy related.

If it also happens with Service principal or Workspace identity, I would raise a Microsoft support ticket with timestamp, correlation ID, connection ID, and affected shortcut details.