Hello @jay marathe ,
Welcome to the MS Q&A platform.
Could you please let us know if this is an intermittent issue or if this issue is happening whenever trying to copy the data from the Azure database to Azure table Storage?
When you say "able to copy 50% of data", is this failing every time at the same records to copy?
This error generally occurs if there is any issue with the storage account or blob name.
Please take a look at this naming rules.