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Why did I get an error when adding a permitted network to a VPC?

Why did I get an error when adding a permitted network to a VPC?

You tried to add a permitted network, but got an error that the VPC does not have Cloud Service Endpoint (CSE) enabled.

You are unable to add a permitted network to a VPC.

By default, only VPCs created on or after 10/09/2019 are enabled to use DNS Services.

For VPCs created as a permitted network before that date, review Enabling Cloud Service Endpoints to contact IBM Support and get the VPC CSE enabled. You are then able to add this VPC for your DNS zone.