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Create a pointer record (PTR) for reserved public IP address

I need to create a pointer record (PTR) for a reserved public IP address provided by Oracle.

I checked article Setting Up Reverse DNS Zones in Oracle Cloud Infrastructure Documentation.

I attempted to create the reversed DNS zone following the instructions provided in that article, but I receive the following error message:

Authorization failed or requested resource already exists.

For example, let's say my reserved public IP address is I have already tried creating the following DNS zones: 193- and 193.193.193.in-addr.arpa. But I receive the above error message.

I only need this for this particular record.