How to Fix MotherDuck "authentication failed" in Skippr

April 2026

MotherDuck authentication failures usually mean the token is wrong, expired, or no longer has access to the selected database.

Short Answer

MotherDuck authentication failed usually means MOTHERDUCK_TOKEN is wrong, expired, or no longer has access to the selected database.

The fastest fix is to verify the token value, confirm the database access still exists, and reconnect the source or destination with the corrected token.

Why This Error Happens

MotherDuck auth failures are usually token issues, not network issues. The endpoint is reachable, but the token does not authorize the database you asked for.

• Wrong MOTHERDUCK_TOKEN value.
• Expired or rotated token.
• Token no longer has access to the selected database.
• Environment variable is not loaded in the shell running Skippr.

How to Fix It with Skippr

Check the token in the environment first, then confirm it still belongs to an active account with access to the target database.

• Verify the current MOTHERDUCK_TOKEN value.
• Confirm the token still belongs to an active account.
• Check access to the selected MotherDuck database.
• Reload the environment variable if needed.
• Reconnect the MotherDuck source or warehouse and rerun the pipeline.

When Skippr Is the Better Path

Once the token is correct, Skippr keeps the rest of the pipeline compact. You do not need a separate setup path just to move from auth repair to warehouse delivery.

That helps when the auth issue is small and the rest of the pipeline should stay boring.