How to detach and delete Elastic network interface

Question

I am trying to delete all the resources I created in AWS,I have terminated all ec2 instances,the only resources I have remaining are Elastic network interface,1 database security group,1subnet and 1 private route table and 1 vpc.Now it appears the only way  I can delete every other resource is to first delete network interface and the only way I can delete network interface is to first detach network interface,so when I tried to detach network interface,I got error message 👇
"Failed to detach the network interface. API error: "You do not have permission to access the specified resource."
After some research I decided to create I AM policy for detaching network interface and subsequently attach the policy to a role,after attaching the policy to a role I still found it impossible to detach the network interface.I need help on a solution to resolve this problem.
Thanks

Accepted Answer

Hello.

Please check the "Description" of the ENI that cannot be deleted.  
If you check the "Description", there may be an AWS service that uses the ENI listed.  
I suspect that the ENI is probably being used by some AWS service and cannot be deleted.  
https://repost.aws/knowledge-center/vpc-delete-elastic-network-interface

A common problem is forgetting to remove RDS or forgetting to remove RDS Proxy.  
In addition, if the VPC endpoint is using an ENI or if ALB or NAT Gateway remains, the ENI cannot be deleted.  
https://repost.aws/knowledge-center/vpc-delete-requester-managed-endpoint

How to detach and delete Elastic network interface

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