RCP available service

Resource Control Policies (RCPs) currently apply to actions for a specific set of AWS services. According to the most recent documentation, RCPs support:

• Amazon S3
• AWS Security Token Service
• AWS Key Management Service
• Amazon SQS
• AWS Secrets Manager
• Amazon Cognito user pools
• Amazon Elastic Container Registry
• Amazon OpenSearch Serverless

If you're experiencing an issue where the system indicates that Amazon ECR is not supported when you try to apply an RCP, there could be a few possible explanations:

1. There might be a phased rollout of ECR support across different AWS regions
2. The feature might be very recently added and there could be a delay in its availability
3. There could be a specific limitation or requirement for using RCPs with ECR that needs to be addressed

To resolve this issue, I would recommend:

• Verifying that you're using AWS Organizations with the "all features" option enabled (not just "Consolidated billing features")
• Checking that RCPs are properly enabled in your organization
• Contacting AWS Support for the most up-to-date information on ECR support with RCPs
  Sources
  Resource control policies (RCPs) - AWS Organizations
  Introducing resource control policies (RCPs), a new type of authorization policy in AWS Organizations | AWS News Blog