please confirm that the AWS CLI command below doesn't return any outputs:
aws route53resolver list-resolver-endpoints
Note: Please specify the region '--region [region]' where you supposed to have the ENIs.
if there is an output, then the R53 Resolver Endpoints still exists and you need to delete them. If not and upon checking in the EC2 Console in the 'Network Interfaces' and there are still R53 resolver endpoint ENIs, then you need to reach out to AWS Support for further assistance.
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