Azure Data Factory - Inner Activity Failed In For Each

This error means one of the activities inside your ForEach loop failed, which causes the whole ForEach activity to fail. To troubleshoot, check the activity run details in ADF Monitor tab and look at which item in the loop failed and why. The InternalServerError usually points to an issue with the linked service or destination system (for example, database timeout, authentication, or network issue). Fix the root cause in the failing inner activity, then rerun the pipeline.