ENI marked as in-use after deleing the Lambda resource attached to it.

Question

I had this issue before and was able to fix it by simply destroying the Lambda resource; however, this time it's stuck on in-use even after deleting the associated Lambda. Any idea why it's not becoming **available** instead of _in-use_ ?  
  
-----

```
Error detaching network interface
eni-078feb502bae65147: You are not allowed to manage 'ela-attach' attachments.
```

Any help to resolve this would be much appreciated  
  
Edited by: Praveen-Premarratne on Jul 2, 2020 7:52 AM  
  
Edited by: Praveen-Premarratne on Jul 3, 2020 5:07 AM

Answer

This is solved now. It was a CloudFormation stack that booked the ENI from deletion.  
Once the CloudFromation stack was destroyed, it worked.

ENI marked as in-use after deleing the Lambda resource attached to it.

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