@Patankar, Narottam If the aim is to copy RMAN backup from the storage in prod subscription to storage in dev subscription, you may use azcopy.
https://zcusa.951200.xyz/en-us/azure/storage/common/storage-use-azcopy-v10#transfer-data
You also need to
- setup security for source and dest storage accounts as per: https://zcusa.951200.xyz/en-us/azure/storage/common/authorize-data-access
- setup network config as per: https://zcusa.951200.xyz/en-us/azure/storage/common/storage-network-security
Regards
Geetha