インスタンスを作成すると「Limit for ephemeral public IP per tenant of 6 has been already reached. 」とエラーが出る。

Summary:

When I create an instance, I get the error message "Limit for ephemeral public IP per tenant of 6 has already been reached."
When I look up help, I see that I've reached the limit of 6 ephemeral public IPs, so I'm looking for a way to increase the limit.
However, when I check the service limits (https://docs.oracle.com/ja-jp/iaas/Content/General/Concepts/servicelimits.htm),
there's no mention of a limit of 6 ephemeral public IPs, and when I open "Limits, quotas and usage" in the OCI console, I can't find any information about the ephemeral public IP limit.