When creating a managed cluster on vSphere using ACM, if fails with the certificate error. I am using the same CA certs downloaded from the vCenter and using it when the creating the credentials. I am able to use those certs to create an IPI based installation but using with ACM always fails! I can see the secrets created in the cluster namespace but still fails as below,
 
Platform credentials failed authentication check: Post "https://vcsnsx-vc.infra.demo.redhat.com/sdk": tls: failed to verify certificate: x509: certificate signed by unknown authority
 
Discussion with the engineering team is here https://redhat-internal.slack.com/archives/CE3ETN3J8/p1770908512004219
 
After trying various things, we could make it work by appending the contents of ca-bundle.crt from hive-trusted-cabundle to vCenter CA (Note that this has to be done before creating the cluster but when creating the credential)