Using Private Endpoint in OIC3 failed

Hi Team,

We have a requirement to access the DBCS database which is in OCI private subnet from the OIC integration. We are trying to use the private endpoint instead of agent.

1. We have created a private endpoint in the same subnet and VCN, where exactly the DB system resides.
2. Using Oracle DBaas adapter, We are trying to create a connection by providing the DB host,port,service name,username,password and choosed the access type as private endpoint, click on test connection, but it throws below error

Unable to test connection dbaas_erpdevdb.
{"detail":"","status":"HTTP 500 Internal Server Error","title":"Operation [testConnection] failed: This connection is configured with an address which is not in an allowable range","type":"https://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.5.1"}