How I can delete a network interface that is connected with lambda function that does not exist anymore

Hi there,

I have faced issues with removing my network interface. AWS console says it's attached to the lambda function but that function was removed several months ago (screenshot) so I'm not sure what is wrong.

I've tried also some recommendations from https://repost.aws/questions/QUqNXHXZIPT7WFxmB4lCmaUA/cannot-delete-network-interface by trying to detach it but I still have no luck with that.

admin@ip-x-x-x-x:~$ aws ec2 detach-network-interface --attachment-id ela-attach-06300c91f31880db9 --region=us-east-1 --force

An error occurred (OperationNotPermitted) when calling the DetachNetworkInterface operation: You are not allowed to manage 'ela-attach' attachments.

Could you please let me know what else I need to try?