This browser is no longer supported.
Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support.
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(28.799999999999997, 16%, 12%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ESP%3C/text%3E%3C/svg%3E)
Failure happened on 'Sink' side. ErrorCode=UserErrorKustoWriteFailed,'Type=Microsoft.DataTransfer.Common.Shared.HybridDeliveryException,Message=Failure status of the first blob that failed: Mapping reference 'TestTable' of type 'mappingReference' in database 'XXXXX' could not be found.,Source=Microsoft.DataTransfer.Runtime.KustoConnector,'
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(134.4, 9%, 23%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EKM%3C/text%3E%3C/svg%3E)
@Siresh Peesa (HCL America Inc) ,
Thanks for your query. To better assist on your query could you please provide few additional details as requested by Vaibhav? In case if your issue is already resolved, please do consider to share the resolution details here with community, as it would help others reading this thread. And if you still need assistance, please let us know.
Thank you.
Hi @Siresh Peesa (HCL America Inc) ,
We still have not heard back from you. In case if you have already found a solution, please do consider to share it here with community. If you still need assistance, please do share additional info as requested by Vaibhav, we will gladly continue to engage.
Thank you
What is the source? Have you checked the mapping tab of copy activity? Ensure you have source columns mapped to target Kusto columns.
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(176, 28.000000000000004%, 27%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EJL%3C/text%3E%3C/svg%3E)
I had the same issue, I had to go into ADX user permissions and add the ADF as a "user"(app) with write permissions