HTTP API - Custom Domain (Regional) - incorrect SSL cert?

Question

Currently facing this issue. Unclear about nature:  
  
1. API Gateway, Custom Domain * - a 4th-level domain name  
  
2. API Gateway, HTTP API, Invoke URL ** - mapped to custom domain above  
  
Both ** and ** appear to be sending the same certificate down the wire (judging from issuance date). This is the valid cert for **, but it is invalid for **.

Answer

Fixed my own bug.  
  
Real problem: DNS record, A name, was pointing at the APIGW:APIURL instead of at the APIGW:CustomDomainURL

Answer

Check that DNS A record is pointing at the correct endpoint.

HTTP API - Custom Domain (Regional) - incorrect SSL cert?

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