Network Interface is Currently In Use

Question

I am trying to delete the VPC, Subnets and Security Groups but they are associated to ENI, therefore I have to delete Network Interface first. However while deleting it says "Network Interface is Currently In Use". In CloudShell when I run the command:
./findEniAssociations --eni eni-000000 --region eu-north-1

Found eni-000000000 with subnet-11111111 using Security Groups sg-22222222
Searching for Lambda function versions using subnet-11111111 and Security Groups sg-2222222...

No Lambda functions or versions found that were using the same subnet as this ENI.
If this ENI is not deleted automatically in the next 24 hours then it may be 'stuck'. If the ENI will not allow you to delete it manually after 24 hours then please contact AWS support and send them the output of this script.

In this case, I don't have a chance to contact AWS support, since I am in free tier. How can I get rid of this problem?
Thanks

Accepted Answer

For those who faced with the same issue, should check DMS (Data Migration Service).
When I deleted the DMS Replication instance, the ENI also was automatically deleted, so we can remove SG, Subnets, VPC one by one without any error.

Answer

Hello.

It may just be that it takes time to delete the ENI, so it may disappear automatically.  
If it does not disappear, please contact AWS Support.

Even if you are using the free tier, you can contact AWS Support for free if you have any issues with your AWS account.  
We recommend that you contact AWS Support by opening a case under "Account and billing".  
https://docs.aws.amazon.com/awssupport/latest/user/case-management.html

Answer

Link to AWS documentation when possible to help with additional context.

Network Interface is Currently In Use

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