How to Migrate from existing S3 bucket to AWS Amply

Question

How to Migrate from existing S3 bucket to AWS Amply -- Having trouble   
In AWS Amplify --- the Domain activation is Failed   
  
**App Id**: d3atgs1o2q9txg  
**Region**: us-east-1  
**Step**: Domain activation  
**Status**: Failed  
  
**Issue/question**  
Trying to migrate the domain from an existing S3 bucket to AWS Amplify.  
  
**Error message**  
Error message: One or more of the CNAMEs you provided are already associated with a different resource.  
  
**Additional information**  
Deployment to aws amplify functions properly: https://master.d3atgs1o2q9txg.amplifyapp.com  
The existing site (hosted by Route 53 with S3 & Cloudfront) functions properly: https://www.3dwrestlerstats.com  
  
Now I'd like to have the hosting done via AWS Amplify, but it fails when I try to activate the domain via the AWS Amplify Console.  
  
I searched quite a bit, but didn't find must specifically related to this type of migration, so submitting an issue.  
Thanks in advance.

Answer

This was a bit hard to find --- but   
  
The last step on this page related to CNAME Already Exists solved the issue. I had a Cloudfront distribution in front of the S3 Bucket and once I removed the alternate domain names from that distribution, I was able to set up the domains on AWS Amplify.   
  
https://docs.aws.amazon.com/amplify/latest/userguide/custom-domain-troubleshoot-guide.html

How to Migrate from existing S3 bucket to AWS Amply

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