can't load a file from lakehouse using Data Flow Gen2

Hi jean0304 ,

Thank you for reaching out to the Microsoft Fabric Community Forum. 

This behavior is not caused by missing Lakehouse permissions. Even though you are a Workspace Admin, Dataflow Gen2 uses Fabric data connections and access tokens that can take time to synchronize, especially if connections or permissions were recently modified or recreated.

In this case, the Lakehouse may appear selectable but cannot be opened or browsed from Dataflow Gen2. This is a known intermittent Fabric behavior and is typically resolved once backend synchronization completes.

Recommended actions to be taken:

• Sign out and sign back in to Fabric to refresh the token.

• Try again after some time to allow connection propagation.

• Open Fabric in a new InPrivate/Incognito browser session.

• If needed, recreate the Dataflow Gen2 after the sync completes.

Since you’ve seen this resolve on its own previously, this aligns with a Fabric connection sync delay rather than a configuration issue.

If the issue persists after several hours, please share the exact error text and confirm whether it occurs across multiple Lakehouses.