Hello @Mittal, Abhinav (Contractor)
Based on the error message you provided, it seems like there is an issue with the payload of the Managed Private Endpoint. However, without looking at the exact payload and the ARM template, it is difficult to pinpoint the exact issue.
Here are a few things you can check to troubleshoot the issue:
Check if the private endpoint already exists in the factory?
Check if you have the correct permissions to deploy the managed private endpoint?